NEET 2019 · Biology

NEET 2019 Biology Questions with Solutions

The NEET 2019 paper had 90 Biology questions from 27 chapters. By section: 45 Botany and 45 Zoology.

Cell: The Unit of Life, Molecular Basis of Inheritance and The Living World had the most questions (7 each).

14 questions below have the answer and explanation free; the other 76 are in Premium.

Practise NEET 2019 Biology free

Biology questions: 90
Chapters covered: 27
Solved free here: 14 of 90
Easy / Medium / Hard: 67 / 23 / 0

Difficulty is NEET MIND's own tag for each question.

Chapter-wise: NEET 2019 Biology

How many questions each chapter had in NEET 2019. Open a chapter for its questions from every year.

All 90 NEET 2019 Biology questions

In paper order. Try each one, then open the answer where it is shown.

Question 1 (NEET 2019, Q46)
Biotechnology: Principles and ProcessesBotanyEasy
A selectable marker is used to:
1. Option A: Mark a gene on a chromosome for isolation using restriction enzyme
2. Option B: Help in eliminating the non-transformants, so that the transformants can be regenerated
3. Option C: Identify the gene for a desired trait in an alien organism
4. Option D: Select a suitable vector for transformation in a specific crop
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Question 2 (NEET 2019, Q47)
Biodiversity and ConservationBotanyEasy
Western Ghats have a large number of plant and animal species that are not found anywhere else. Which of the following terms will you use to notify such species?
1. Option A: Keystone
2. Option B: Endemic
3. Option C: Vulnerable
4. Option D: Threatened
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Question 3 (NEET 2019, Q48)
EcosystemBotanyEasy
Which of the following statements about ozone is correct?
1. Option A: Stratospheric ozone protects us from UV radiations
2. Option B: Tropospheric ozone protects us from UV radiations
3. Option C: Stratospheric ozone is 'bad'
4. Option D: Tropospheric ozone is 'good'
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Question 4 (NEET 2019, Q49)
Biotechnology and Its ApplicationsBotanyEasy
Exploration of molecular, genetic and species level diversity for novel products of economic importance is known as:
1. Option A: Bioprospecting
2. Option B: Biopiracy
3. Option C: Bioenergetics
4. Option D: Bioremediation
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Question 5 (NEET 2019, Q50)
EcosystemBotanyEasy
Which of the following is an innovative remedy for plastic waste?
1. Option A: Electrostatic precipitator
2. Option B: Burning in the absence of oxygen
3. Option C: Burying 500 m deep below soil surface
4. Option D: Polyblend
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Question 6 (NEET 2019, Q51)
Organisms and PopulationsBotanyMedium
Between which among the following, the relationship is not an example of commensalism?
1. Option A: Female wasp and fig species
2. Option B: Orchid and the tree on which it grows
3. Option C: Cattle Egret and grazing cattle
4. Option D: Sea Anemone and Clown fish
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Correct answer: (A) Female wasp and fig species
Explanation
Female wasp and fig species exhibit mutualism, not commensalism. Orchid-tree, cattle egret-grazing cattle, and sea anemone-clown fish are examples of commensalism.
Question 7 (NEET 2019, Q52)
EcosystemBotanyEasy
If an agricultural field is liberally irrigated for a prolonged period of time, it is likely to face a problem of:
1. Option A: Salinity
2. Option B: Metal toxicity
3. Option C: Alkalinity
4. Option D: Acidity
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Question 8 (NEET 2019, Q53)
Microbes in Human WelfareBotanyEasy
Which of the following statements about methanogens is not correct?
1. Option A: They produce methane gas
2. Option B: They can be used to produce biogas
3. Option C: They are found in the rumen of cattle and their excreta
4. Option D: They grow aerobically and breakdown cellulose-rich food
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Question 9 (NEET 2019, Q54)
Biotechnology and Its ApplicationsBotanyEasy
In mung bean, resistance to yellow mosaic virus and powdery mildew were brought about by:
1. Option A: Hybridization and selection
2. Option B: Mutation breeding
3. Option C: Biofortification
4. Option D: Tissue culture
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Question 10 (NEET 2019, Q55)
The Living WorldBotanyEasy
Coca alkaloid or cocaine is obtained from:
1. Option A: Datura
2. Option B: Papaver somniferum
3. Option C: Atropa belladonna
4. Option D: Erythroxylum coca
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Question 11 (NEET 2019, Q56)
Microbes in Human WelfareBotanyMedium
Among the following pairs of microbes, which pair has both the microbes that can be used as biofertilizers?
1. Option A: Aspergillus and Cyanobacteria
2. Option B: Aspergillus and Rhizopus
3. Option C: Rhizobium and Rhizopus
4. Option D: Cyanobacteria and Rhizobium
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Question 12 (NEET 2019, Q57)
Biotechnology: Principles and ProcessesBotanyMedium
Given below are four statements pertaining to separation of DNA fragments using Gel electrophoresis. Identify the incorrect statements. (a) DNA is negatively charged molecule and so it is loaded on gel towards the Anode terminal. (b) DNA fragments travel along the surface of the gel whose concentration does not affect movement of DNA. (c) Smaller the size of DNA fragment, larger is the distance it travels through it. (d) Pure DNA can be visualized directly by exposing to UV radiation. Choose correct answer from the options given below:
1. Option A: (a), (b) and (d)
2. Option B: (a), (c) and (d)
3. Option C: (a), (b) and (c)
4. Option D: (b), (c) and (d)
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Question 13 (NEET 2019, Q58)
Biotechnology: Principles and ProcessesBotanyEasy
An enzyme catalysing the removal of nucleotides from ends of DNA is:
1. Option A: Protease
2. Option B: DNA ligase
3. Option C: Endonuclease
4. Option D: Exonuclease
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Question 14 (NEET 2019, Q59)
Molecular Basis of InheritanceBotanyEasy
In RNAi, the genes are silenced using:
1. Option A: ds-DNA
2. Option B: ds-RNA
3. Option C: ss-DNA
4. Option D: ss-RNA
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Question 15 (NEET 2019, Q60)
Sexual Reproduction in Flowering PlantsBotanyMedium
Which is the most common type of embryo sac in angiosperms?
1. Option A: Bisporic with two sequential mitotic divisions
2. Option B: Tetrasporic with one mitotic stage of divisions
3. Option C: Monosporic with three sequential mitotic divisions
4. Option D: Monosporic with two sequential mitotic divisions
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Question 16 (NEET 2019, Q61)
Molecular Basis of InheritanceBotanyEasy
From the following, identify the correct combination of salient features of Genetic Code
1. Option A: Degenerate, Non-overlapping, Non-ambiguous
2. Option B: Universal, Non-ambiguous, Overlapping
3. Option C: Degenerate, Overlapping, Commaless
4. Option D: Universal, Ambiguous, Degenerate
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Question 17 (NEET 2019, Q62)
Molecular Basis of InheritanceBotanyEasy
Which scientist experimentally proved that DNA is the sole genetic material in bacteriophage?
1. Option A: Jacob and Monod
2. Option B: Beadle and Tatum
3. Option C: Meselson and Stahl
4. Option D: Hershey and Chase
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Question 18 (NEET 2019, Q63)
Molecular Basis of InheritanceBotanyEasy
In the process of transcription in Eukaryotes, the RNA polymerase I transcribes -
1. Option A: Precursor of mRNA, hnRNA
2. Option B: mRNA with additional processing, capping and tailing
3. Option C: tRNA, 5S rRNA and snRNAs
4. Option D: rRNAs – 28S, 18S and 5.8S
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Question 19 (NEET 2019, Q64)
Principles of Inheritance and VariationBotanyEasy
In which genetic condition, each cell in the affected person, has three sex chromosomes XXY?
1. Option A: Turner’s Syndrome
2. Option B: Thalassemia
3. Option C: Klinefelter’s Syndrome
4. Option D: Phenylketonuria
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Question 20 (NEET 2019, Q65)
Molecular Basis of InheritanceBotanyEasy
What initiation and termination factors are involved in transcription in Eukaryotes?
1. Option A: α and σ, respectively
2. Option B: σ and ρ, respectively
3. Option C: α and β, respectively
4. Option D: β and γ, respectively
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Question 21 (NEET 2019, Q66)
EvolutionBotanyEasy
Which of the following statements is correct about the origin and evolution of man?
1. Option A: Neanderthal men lived in Asia between 1,00,000 and 40,000 years back.
2. Option B: Agriculture came around 50,000 years back.
3. Option C: The Dryopithecus and Ramapithecus primates existing 15 million years ago, walked like men.
4. Option D: Homo habilis probably ate meat.
Show answer & explanationHide answer & explanation
Correct answer: (A) Neanderthal men lived in Asia between 1,00,000 and 40,000 years back.
Explanation
Neanderthal men lived in Asia around 1,00,000 to 40,000 years ago. Agriculture began around 10,000 years ago. Dryopithecus and Ramapithecus were hairy primates that walked more like gorillas and chimpanzees. Homo habilis probably did not eat meat.
Question 22 (NEET 2019, Q67)
Principles of Inheritance and VariationBotanyEasy
The production of gametes by the parents, the formation of zygotes, the $F_1$ and $F_2$ plants, can be understood using
1. Option A: Wenn diagram
2. Option B: Pie diagram
3. Option C: A pyramid diagram
4. Option D: Punnett square
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Question 23 (NEET 2019, Q68)
Photosynthesis in Higher PlantsBotanyMedium
In Hatch and Slack pathway, the primary $CO_2$ acceptor is
1. Option A: Rubisco
2. Option B: Oxaloacetic acid
3. Option C: Phosphoglyceric acid
4. Option D: Phosphoenol pyruvate
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Question 24 (NEET 2019, Q69)
Plant Growth and DevelopmentBotanyMedium
Removal of shoot tips is a very useful technique to boost the production of tea-leaves. This is because
1. Option A: Gibberellins delay senescence of leaves.
2. Option B: Gibberellins prevent bolting and are inactivated.
3. Option C: Auxins prevent leaf drop at early stages.
4. Option D: Effect of auxins is removed and growth of lateral buds is enhanced.
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Question 25 (NEET 2019, Q70)
Photosynthesis in Higher PlantsBotanyEasy
One scientist cultured Cladophora in a suspension of Azotobacter and illuminated the culture by splitting light through a prism. He observed that bacteria accumulated mainly in the region of :
1. Option A: Blue and red light
2. Option B: Violet and green light
3. Option C: Indigo and green light
4. Option D: Orange and yellow light
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Question 26 (NEET 2019, Q71)
Plant Growth and DevelopmentBotanyEasy
In order to increase the yield of sugarcane crop, which of the following plant growth regulators should be sprayed?
1. Option A: Cytokinins
2. Option B: Ethylene
3. Option C: Auxins
4. Option D: Gibberellins
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Question 27 (NEET 2019, Q72)
Sexual Reproduction in Flowering PlantsBotanyEasy
What type of pollination takes place in Vallisneria?
1. Option A: Male flowers are carried by water currents to female flowers at surface of water.
2. Option B: Pollination occurs in submerged condition by water.
3. Option C: Flowers emerge above surface of water and pollination occurs by insects.
4. Option D: Flowers emerge above water surface and pollen is carried by wind.
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Question 28 (NEET 2019, Q73)
Sexual Reproduction in Flowering PlantsBotanyEasy
In which one of the following, both autogamy and geitonogamy are prevented?
1. Option A: Maize
2. Option B: Wheat
3. Option C: Papaya
4. Option D: Castor
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Question 29 (NEET 2019, Q74)
Structural Organisation in AnimalsBotanyEasy
Match the placental types (column-I) with their examples (column-II).
1. Option A: (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
2. Option B: (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
3. Option C: (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
4. Option D: (a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
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Question 30 (NEET 2019, Q75)
Cell: The Unit of LifeBotanyEasy
Match the column I with column II. Choose the correct match from the options given below:
1. Option A: (a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)
2. Option B: (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
3. Option C: (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
4. Option D: (a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
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Question 31 (NEET 2019, Q76)
BiomoleculesBotanyEasy
Prosthetic groups differ from co-enzymes in that-
1. Option A: They can serve as co-factors in a number of enzyme-catalyzed reactions
2. Option B: They require metal ions for their activity
3. Option C: They (prosthetic groups) are tightly bound to apoenzymes
4. Option D: Their association with apoenzymes is transient
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Question 32 (NEET 2019, Q77)
Cell Cycle and Cell DivisionBotanyEasy
Crossing over takes place between which chromatids and in which stage of the cell cycle?
1. Option A: Non-sister chromatids of non-homologous chromosomes at Pachytene stage of prophase I
2. Option B: Non-sister chromatids of non-homologous chromosomes at Zygotene stage of prophase I
3. Option C: Non-sister chromatids of homologous chromosomes at Pachytene stage of prophase I
4. Option D: Non-sister chromatids of homologous chromosomes at Zygotene stage of prophase I
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Question 33 (NEET 2019, Q78)
BiomoleculesBotanyEasy
"Ramachandran plot" is used to confirm the structure of
1. Option A: DNA
2. Option B: RNA
3. Option C: Proteins
4. Option D: Triacylglycerides
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Question 34 (NEET 2019, Q79)
Photosynthesis in Higher PlantsBotanyEasy
Which of the following is not a feature of active transport of solutes in plants?
1. Option A: Requires ATP
2. Option B: Occurs against concentration gradient
3. Option C: Non-selective
4. Option D: Occurs through membranes
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Question 35 (NEET 2019, Q80)
Microbes in Human WelfareBotanyMedium
Which of the following bacteria reduce nitrate in soil into nitrogen?
1. Option A: Nitrosomonas
2. Option B: Nitrobacter
3. Option C: Nitrococcus
4. Option D: Thiobacillus
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Question 36 (NEET 2019, Q81)
Photosynthesis in Higher PlantsBotanyEasy
What will be the direction of flow of water when a plant cell is placed in a hypotonic solution?
1. Option A: No flow of water in any direction
2. Option B: Water will flow in both directions
3. Option C: Water will flow out of the cell
4. Option D: Water will flow into the cell
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Question 37 (NEET 2019, Q82)
Respiration in PlantsBotanyEasy
Where is the respiratory electron transport system (ETS) located in plants?
1. Option A: Intermembrane space
2. Option B: Mitochondrial matrix
3. Option C: Outer mitochondrial membrane
4. Option D: Inner mitochondrial membrane
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Correct answer: (D) Inner mitochondrial membrane
Explanation
The respiratory electron transport system (ETS) in plants is located on the inner mitochondrial membrane where oxidative phosphorylation takes place.
Question 38 (NEET 2019, Q83)
The Living WorldBotanyEasy
Which of the following is against the rules of ICBN?
1. Option A: Generic and specific names should be written starting with small letters.
2. Option B: Hand written scientific names should be underlined.
3. Option C: Every species should have a generic name and a specific epithet.
4. Option D: Scientific names are in Latin and should be italicized.
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Question 39 (NEET 2019, Q84)
BiomoleculesBotanyEasy
Mad cow disease in cattle is caused by an organism which has :
1. Option A: Free DNA without protein coat
2. Option B: Inert crystalline structure
3. Option C: Abnormally folded protein
4. Option D: Free RNA without protein coat
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Question 40 (NEET 2019, Q85)
The Living WorldBotanyEasy
Which of the following statements is correct?
1. Option A: Lichens are not good pollution indicators.
2. Option B: Lichens do not grow in polluted areas.
3. Option C: Algal component of lichens is called mycobiont.
4. Option D: Fungal component of lichens is called phycobiont.
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Question 41 (NEET 2019, Q86)
The Living WorldBotanyEasy
Match the organisms in Column I with habitats in Column II. Select the correct answer from the options given below:
1. Option A: (a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
2. Option B: (a)-(iv), (b)-(i), (c)-(iii), (d)-(ii)
3. Option C: (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
4. Option D: (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
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Question 42 (NEET 2019, Q87)
Structural Organisation in AnimalsBotanyMedium
In the dicot root the vascular cambium originates from :
1. Option A: Intrafascicular and interfascicular tissue in a ring
2. Option B: Tissue located below the phloem bundles and a portion of pericycle tissue above protoxylem.
3. Option C: Cortical region
4. Option D: Parenchyma between endodermis and pericycle
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Question 43 (NEET 2019, Q88)
Structural Organisation in AnimalsBotanyEasy
Which of the following shows whorled phyllotaxy?
1. Option A: Calotropis
2. Option B: Mustard
3. Option C: China rose
4. Option D: Alstonia
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Question 44 (NEET 2019, Q89)
Structural Organisation in AnimalsBotanyEasy
Regeneration of damaged growing grass following grazing is largely due to :
1. Option A: Secondary meristem
2. Option B: Lateral meristem
3. Option C: Apical meristem
4. Option D: Intercalary meristem
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Question 45 (NEET 2019, Q90)
Structural Organisation in AnimalsBotanyMedium
Bicarpellary ovary with obliquely placed septum is seen in :
1. Option A: Sesbania
2. Option B: Brassica
3. Option C: Aloe
4. Option D: Solanum
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Question 46 (NEET 2019, Q91)
Human ReproductionZoologyMedium
Select the incorrect statement regarding inbreeding.
1. Option A: Inbreeding depression cannot be overcome by out-crossing
2. Option B: Inbreeding helps in elimination of deleterious alleles from the population
3. Option C: Inbreeding is necessary to evolve a pure line in any animal
4. Option D: Continued inbreeding reduces fertility and leads to inbreeding depression
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Question 47 (NEET 2019, Q92)
Microbes in Human WelfareZoologyEasy
A biocontrol agent to be a part of an integrated pest management should be :
1. Option A: Species-specific and inactive on non-target organisms
2. Option B: Species-specific and symbiotic
3. Option C: Free living and broad spectrum
4. Option D: Narrow spectrum and symbiotic
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Question 48 (NEET 2019, Q93)
Biotechnology: Principles and ProcessesZoologyEasy
Match the following enzymes with their functions: Select the correct option from the following:
1. Option A: a(i), b(iv), c(i), d(iii)
2. Option B: a(iii), b(i), c(iv), d(ii)
3. Option C: a(iii), b(iv), c(i), d(ii)
4. Option D: a(iv), b(iii), c(i), d(ii)
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Question 49 (NEET 2019, Q94)
Biotechnology: Principles and ProcessesZoologyEasy
The two antibiotic resistance genes on vector pBR322 are for
1. Option A: Tetracycline and Kanamycin
2. Option B: Ampicillin and Tetracycline
3. Option C: Ampicillin and Chloramphenicol
4. Option D: Chloramphenicol and Tetracycline
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Question 50 (NEET 2019, Q95)
Biotechnology and Its ApplicationsZoologyEasy
Exploitation of bioresources of a nation by multinational companies without authorization from the concerned country is referred to as
1. Option A: Biowar
2. Option B: Bioweapon
3. Option C: Biopiracy
4. Option D: Bioethics
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Question 51 (NEET 2019, Q96)
EcosystemZoologyMedium
Carnivorous animals - lions and leopards, occupy the same niche but lions predate mostly larger animals and leopards take smaller ones. This mechanism of competition is referred to as-
1. Option A: Competitive exclusion
2. Option B: Character displacement
3. Option C: Altruism
4. Option D: Resource partitioning
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Question 52 (NEET 2019, Q97)
EcosystemZoologyEasy
Decline in the population of Indian native fishes due to introduction of Clarias gariepinus in river Yamuna can be categorised as
1. Option A: Alien species invasion
2. Option B: Co-extinction
3. Option C: Habitat fragmentation
4. Option D: Over exploitation
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Question 53 (NEET 2019, Q98)
Molecular Basis of InheritanceZoologyEasy
Match the following RNA polymerases with their transcribed products: Select the correct option from the following :
1. Option A: (a)-(iii), (b)-(ii), (c)-(i)
2. Option B: (a)-(i), (b)-(iii), (c)-(ii)
3. Option C: (a)-(i), (b)-(ii), (c)-(iii)
4. Option D: (a)-(ii), (b)-(iii), (c)-(i)
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Question 54 (NEET 2019, Q99)
Principles of Inheritance and VariationZoologyMedium
In a marriage between male with blood group A and female with blood group B, the progeny had either blood group AB or B. What could be the possible genotype of parents?
1. Option A: Option 1
2. Option B: Option 2
3. Option C: Option 3
4. Option D: Option 4
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Question 55 (NEET 2019, Q100)
EvolutionZoologyEasy
A population of a species invades a new area. Which of the following condition will lead to Adaptive Radiation?
1. Option A: Area with many habitats occupied by a large number of species.
2. Option B: Area with large number of habitats having very low food supply.
3. Option C: Area with a single type of vacant habitat.
4. Option D: Area with many types of vacant habitats.
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Correct answer: (D) Area with many types of vacant habitats.
Explanation
Adaptive radiation occurs when a population enters a new environment containing many different vacant habitats or ecological niches. Different groups within the population adapt to different environmental conditions, leading to diversification into multiple species. Therefore, an area with many types of vacant habitats promotes adaptive radiation.
Question 56 (NEET 2019, Q101)
Chemical Coordination and IntegrationZoologyMedium
Identify A, B and C in the diagrammatic representation of the mechanism of hormone action. Select the correct option from the following:
1. Option A: A = Protein Hormone; B = Cyclic AMP; C = Hormone-receptor Complex
2. Option B: A = Steroid Hormone; B = Hormone-receptor Complex; C = Protein
3. Option C: A = Protein Hormone; B = Receptor; C = Cyclic AMP
4. Option D: A = Steroid Hormone; B = Receptor; C = Second Messenger
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Correct answer: (C) A = Protein Hormone; B = Receptor; C = Cyclic AMP
Explanation
'A' represents a protein hormone that cannot cross the lipid bilayer of the plasma membrane and therefore binds to receptors present on the cell surface. 'B' represents the membrane receptor that forms the hormone-receptor complex. This interaction activates intracellular signalling pathways leading to the production of second messengers such as cyclic AMP (cAMP). 'C' represents cyclic AMP, which acts as a second messenger and initiates physiological responses inside the cell.
Question 57 (NEET 2019, Q102)
Human Health and DiseaseZoologyEasy
Humans have acquired immune system that produces antibodies to neutralize pathogens. Still innate immune system is present at the time of birth because it:
1. Option A: provides passive immunity
2. Option B: is very specific and uses different macrophages
3. Option C: produces memory cells for mounting fast secondary response
4. Option D: has natural killer cells which can phagocytose and destroy microbes
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Question 58 (NEET 2019, Q103)
Human ReproductionZoologyEasy
Select the correct sequence of events.
1. Option A: Gametogenesis → Gamete transfer → Syngamy → Zygote → Cell differentiation → Cell division (Cleavage) → Organogenesis.
2. Option B: Gametogenesis → Gamete transfer → Syngamy → Zygote → Cell division (Cleavage) → Cell differentiation → Organogenesis.
3. Option C: Gametogenesis → Gamete transfer → Syngamy → Zygote → Cell division → (Cleavage) → Organogenesis → Cell differentiation.
4. Option D: Gametogenesis → Syngamy → Gamete transfer → Zygote → Cell division (Cleavage) → Cell differentiation → Organogenesis.
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Question 59 (NEET 2019, Q104)
Human ReproductionZoologyEasy
Which of the following hormones is responsible for both the milk ejection reflex and the foetal ejection reflex?
1. Option A: Relaxin
2. Option B: Estrogen
3. Option C: Prolactin
4. Option D: Oxytocin
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Question 60 (NEET 2019, Q105)
Human ReproductionZoologyMedium
No new follicles develop in the luteal phase of the menstrual cycle because:
1. Option A: Both FSH and LH levels are low in the luteal phase.
2. Option B: Follicles do not remain in the ovary after ovulation.
3. Option C: FSH levels are high in the luteal phase.
4. Option D: LH levels are high in the luteal phase.
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Question 61 (NEET 2019, Q106)
EvolutionZoologyEasy
In Australia, marsupials and placental mammals have evolved to share many similar characteristics. This type of evolution may be referred to as
1. Option A: Convergent Evolution
2. Option B: Adaptive Radiation
3. Option C: Divergent Evolution
4. Option D: Cyclical Evolution
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Correct answer: (A) Convergent Evolution
Explanation
Marsupials and placental mammals evolved independently but developed similar structural and functional characteristics due to adaptation to similar ecological niches. Such evolution of unrelated organisms towards similar features is called convergent evolution.
Question 62 (NEET 2019, Q107)
Principles of Inheritance and VariationZoologyEasy
Match the items of Column-I with Column-II : Select the correct option from the following:
1. Option A: (a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
2. Option B: (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
3. Option C: (a)-(i), (b)-(iv), (c)-(ii), (d)-(iii)
4. Option D: (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
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Question 63 (NEET 2019, Q108)
Molecular Basis of InheritanceZoologyEasy
What will be the sequence of mRNA produced by the following stretch of DNA?
1. Option A: Option 1
2. Option B: Option 2
3. Option C: Option 3
4. Option D: Option 4
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Question 64 (NEET 2019, Q109)
Neural Control and CoordinationZoologyMedium
Which of the following statements is not correct?
1. Option A: In the knee-jerk reflex, stimulus is the stretching of muscle and response is its contraction
2. Option B: An action potential in an axon does not move backward because the segment behind is in a refractory phase
3. Option C: Depolarisation of hair cells of cochlea results in the opening of the mechanically gated potassium-ion channels
4. Option D: Rods are very sensitive and contribute to daylight vision
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Correct answer: (D) Rods are very sensitive and contribute to daylight vision
Explanation
Rods are highly sensitive photoreceptor cells that function mainly in dim light (scotopic vision), whereas cones are responsible for daylight and colour vision. Therefore, the statement that rods contribute to daylight vision is incorrect. The other statements are correct: - Knee-jerk reflex is initiated by stretching of muscle followed by contraction. - Backward movement of action potential is prevented due to the refractory phase. - In cochlear hair cells, depolarisation occurs due to opening of mechanically gated K+ channels.
Question 65 (NEET 2019, Q110)
Locomotion and MovementZoologyEasy
Match the following joints with the bones involved: Select the correct option from the following:
1. Option A: (a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
2. Option B: (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
3. Option C: (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
4. Option D: (a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
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Correct answer: (B) (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
Explanation
Gliding joints are found between the carpals. Hinge joints occur between the humerus and ulna. Pivot joints are present between atlas and axis. Saddle joints are found between the carpal and metacarpal bones of the thumb. Therefore, the correct matching is (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i).
Question 66 (NEET 2019, Q111)
Locomotion and MovementZoologyEasy
Which of the following diseases is an autoimmune disorder?
1. Option A: Gout
2. Option B: Myasthenia gravis
3. Option C: Arthritis
4. Option D: Osteoporosis
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Correct answer: (B) Myasthenia gravis
Explanation
Myasthenia gravis is an autoimmune disorder affecting neuromuscular junctions, leading to muscle weakness and fatigue. Gout is caused by deposition of uric acid crystals in joints. Arthritis refers to inflammation of joints, while osteoporosis is an age-related disorder characterized by decreased bone density.
Question 67 (NEET 2019, Q112)
Chemical Coordination and IntegrationZoologyEasy
Artificial light, extended work-time and reduced sleep-time disrupt the activity of –
1. Option A: Posterior pituitary gland
2. Option B: Thymus gland
3. Option C: Pineal gland
4. Option D: Adrenal gland
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Question 68 (NEET 2019, Q113)
Chemical Coordination and IntegrationZoologyEasy
Which of the following conditions will stimulate parathyroid gland to release parathyroid hormone?
1. Option A: Rise in blood Ca²⁺ levels
2. Option B: Fall in active Vitamin D levels
3. Option C: Fall in blood Ca²⁺ levels
4. Option D: Fall in bone Ca²⁺ levels
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Question 69 (NEET 2019, Q114)
Reproductive HealthZoologyEasy
Which of the following is a correct statement?
1. Option A: IUDs suppress gametogenesis
2. Option B: IUDs once inserted need not be replaced
3. Option C: IUDs are generally inserted by the user herself
4. Option D: IUDs increase phagocytosis of sperms in the uterus
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Question 70 (NEET 2019, Q115)
Reproductive HealthZoologyEasy
Which of the following sexually transmitted diseases do not specifically affect reproductive organs?
1. Option A: Chlamydiasis and AIDS
2. Option B: Genital warts and Hepatitis-B
3. Option C: Syphilis and Genital herpes
4. Option D: AIDS and Hepatitis B
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Question 71 (NEET 2019, Q116)
Breathing and Exchange of GasesZoologyEasy
Select the correct statement.
1. Option A: Expiration is initiated due to contraction of diaphragm.
2. Option B: Expiration occurs due to external intercostal muscles.
3. Option C: Intrapulmonary pressure is lower than atmospheric pressure during inspiration.
4. Option D: Inspiration occurs when atmospheric pressure is less than intrapulmonary pressure.
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Correct answer: (C) Intrapulmonary pressure is lower than atmospheric pressure during inspiration.
Explanation
During inspiration, contraction of diaphragm and external intercostal muscles increases thoracic cavity volume. This decreases intrapulmonary pressure below atmospheric pressure, allowing air to enter the lungs. Expiration occurs mainly due to relaxation of the diaphragm.
Question 72 (NEET 2019, Q117)
Breathing and Exchange of GasesZoologyEasy
The maximum volume of air a person can breathe in after a forced expiration is known as:
1. Option A: Total Lung Capacity
2. Option B: Expiratory Capacity
3. Option C: Vital Capacity
4. Option D: Inspiratory Capacity
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Correct answer: (C) Vital Capacity
Explanation
Vital capacity is the maximum volume of air a person can inspire after a forced expiration or expire after a forced inspiration. It is approximately 4600 mL in a healthy adult.
Question 73 (NEET 2019, Q118)
Body Fluids and CirculationZoologyMedium
All the components of the nodal tissue are autoexcitable. Why does the SA node act as the normal pacemaker?
1. Option A: SA node has the highest rate of depolarisation.
2. Option B: SA node has the lowest rate of depolarisation.
3. Option C: SA node is the only component to generate the threshold potential.
4. Option D: Only SA node can convey the action potential to the other components.
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Question 74 (NEET 2019, Q119)
Body Fluids and CirculationZoologyMedium
A specialised nodal tissue embedded in the lower corner of the right atrium, close to the atrio-ventricular septum, delays the spreading of impulses to heart apex for about 0.1 sec. This delay allows:
1. Option A: the atria to empty completely.
2. Option B: blood to enter aorta.
3. Option C: the ventricles to empty completely.
4. Option D: blood to enter pulmonary arteries.
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Question 75 (NEET 2019, Q120)
Excretory Products and Their EliminationZoologyEasy
Match the following parts of a nephron with their function: Select the correct option from the following:
1. Option A: (a)-(iv), (b)-(i), (c)-(iii), (d)-(ii)
2. Option B: (a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
3. Option C: (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
4. Option D: (a)-(i), (b)-(iv), (c)-(ii), (d)-(iii)
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Correct answer: (C) (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
Explanation
Descending limb of Henle's loop is permeable to water and allows reabsorption of water only. Proximal convoluted tubule reabsorbs ions, water and organic nutrients. Ascending limb of Henle's loop is impermeable to water and reabsorbs salts only. Distal convoluted tubule carries out conditional reabsorption of sodium ions and water. Therefore, option (C) is correct.
Question 76 (NEET 2019, Q121)
Excretory Products and Their EliminationZoologyEasy
Match the items in Column-I with those in Column-II. Select the correct option from the following:
1. Option A: (a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
2. Option B: (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
3. Option C: (a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
4. Option D: (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
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Correct answer: (D) (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
Explanation
Podocytes possess filtration slits used in ultrafiltration. Protonephridia are excretory structures found in Amphioxus. Nephridia are excretory organs of annelids. Renal calculi are formed due to crystallised oxalates. Therefore, option (D) is correct.
Question 77 (NEET 2019, Q122)
Neural Control and CoordinationZoologyMedium
Which of the following receptors are specifically responsible for maintenance of balance of body and posture?
1. Option A: Crista ampullaris and macula
2. Option B: Basilar membrane and otoliths
3. Option C: Hair cells and organ of corti
4. Option D: Tectorial membrane and macula
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Correct answer: (A) Crista ampullaris and macula
Explanation
Crista ampullaris maintains the dynamic balance of the body, while macula present in the utricle and saccule maintains the static balance and posture of the body.
Question 78 (NEET 2019, Q123)
Cell: The Unit of LifeZoologyEasy
Which of the following cell organelles is present in the highest number in secretory cells?
1. Option A: Lysosome
2. Option B: Mitochondria
3. Option C: Golgi complex
4. Option D: Endoplasmic reticulum
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Question 79 (NEET 2019, Q124)
Cell: The Unit of LifeZoologyEasy
Non-membranous nucleoplasmic structures in nucleus are the site for active synthesis of:
1. Option A: tRNA
2. Option B: Protein synthesis
3. Option C: mRNA
4. Option D: rRNA
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Question 80 (NEET 2019, Q125)
Cell: The Unit of LifeZoologyMedium
Which of the following nucleic acids is present in an organism having 70 S ribosomes only?
1. Option A: Double stranded circular DNA with histone proteins
2. Option B: Single stranded DNA with protein coat
3. Option C: Double stranded circular naked DNA
4. Option D: Double stranded DNA enclosed in nuclear membrane
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Question 81 (NEET 2019, Q126)
Cell: The Unit of LifeZoologyMedium
After meiosis I, the resultant daughter cells have:
1. Option A: Four times the amount of DNA in comparison to haploid gamete
2. Option B: Same amount of DNA as in the parent cell in S phase
3. Option C: Twice the amount of DNA in comparison to haploid gamete
4. Option D: Same amount of DNA in comparison to haploid gamete
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Question 82 (NEET 2019, Q127)
BiomoleculesZoologyEasy
Which of the following organic compounds is the main constituent of Lecithin?
1. Option A: Phosphoprotein
2. Option B: Arachidonic acid
3. Option C: Phospholipid
4. Option D: Cholesterol
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Question 83 (NEET 2019, Q128)
Cell: The Unit of LifeZoologyMedium
The main difference between active and passive transport across cell membranes is:
1. Option A: Active transport occurs more rapidly than passive transport
2. Option B: Passive transport is non-selective whereas active transport is selective
3. Option C: Passive transport requires a concentration gradient across a biological membrane whereas active transport requires energy to move solutes
4. Option D: Passive transport is confined to anionic carrier proteins whereas active transport is confined to cationic channel proteins
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Question 84 (NEET 2019, Q129)
Body Fluids and CirculationZoologyMedium
Match the items given in Column-I with those in Column-II and choose the correct option.
1. Option A: (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
2. Option B: (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
3. Option C: (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
4. Option D: (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
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Question 85 (NEET 2019, Q130)
Body Fluids and CirculationZoologyEasy
Kwashiorkor disease is due to:
1. Option A: Protein deficiency not accompanied by calorie deficiency
2. Option B: Simultaneous deficiency of proteins and fats
3. Option C: Simultaneous deficiency of proteins and calories
4. Option D: Deficiency of carbohydrates
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Question 86 (NEET 2019, Q131)
The Living WorldZoologyEasy
Match the following genera with their respective phylum: Select the correct option.
1. Option A: (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
2. Option B: (a)-(iv), (b)-(i), (c)-(iii), (d)-(ii)
3. Option C: (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
4. Option D: (a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)
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Question 87 (NEET 2019, Q132)
The Living WorldZoologyEasy
Which of the following animals are true coelomates with bilateral symmetry?
1. Option A: Annelids
2. Option B: Adult Echinoderms
3. Option C: Aschelminthes
4. Option D: Platyhelminthes
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Question 88 (NEET 2019, Q133)
The Living WorldZoologyEasy
The contrasting characteristics generally in a pair used for identification of animals in Taxonomic Key are referred to as:
1. Option A: Alternate
2. Option B: Lead
3. Option C: Couplet
4. Option D: Doublet
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Question 89 (NEET 2019, Q134)
Cell: The Unit of LifeZoologyMedium
Match the following cell structure with its characteristic: Select the correct option from the following:
1. Option A: (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
2. Option B: (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
3. Option C: (a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
4. Option D: (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
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Question 90 (NEET 2019, Q135)
Structural Organisation in AnimalsZoologyEasy
Which of the following statements is INCORRECT?
1. Option A: Female cockroach possesses sixteen ovarioles in the ovaries.
2. Option B: Cockroaches exhibit mosaic vision with less sensitivity and more resolution.
3. Option C: A mushroom-shaped gland is present in the 6th-7th abdominal segments of male cockroach.
4. Option D: A pair of spermatheca is present in the 6th segment of female cockroach.
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