NEET 2019
Previous Year Questions

A selectable marker is used to:

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?

Which of the following statements about ozone is correct?

Exploration of molecular, genetic and species level diversity for novel products of economic importance is known as:

Which of the following is an innovative remedy for plastic waste?

Between which among the following, the relationship is not an example of commensalism?

If an agricultural field is liberally irrigated for a prolonged period of time, it is likely to face a problem of:

Which of the following statements about methanogens is not correct?

In mung bean, resistance to yellow mosaic virus and powdery mildew were brought about by:

Coca alkaloid or cocaine is obtained from:

Among the following pairs of microbes, which pair has both the microbes that can be used as biofertilizers?

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:

An enzyme catalysing the removal of nucleotides from ends of DNA is:

In RNAi, the genes are silenced using:

Which is the most common type of embryo sac in angiosperms?

From the following, identify the correct combination of salient features of Genetic Code

Which scientist experimentally proved that DNA is the sole genetic material in bacteriophage?

In the process of transcription in Eukaryotes, the RNA polymerase I transcribes -

In which genetic condition, each cell in the affected person, has three sex chromosomes XXY?

What initiation and termination factors are involved in transcription in Eukaryotes?

Which of the following statements is correct about the origin and evolution of man?

The production of gametes by the parents, the formation of zygotes, the $F_1$ and $F_2$ plants, can be understood using

In Hatch and Slack pathway, the primary $CO_2$ acceptor is

Removal of shoot tips is a very useful technique to boost the production of tea-leaves. This is because

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 :

In order to increase the yield of sugarcane crop, which of the following plant growth regulators should be sprayed?

What type of pollination takes place in Vallisneria?

In which one of the following, both autogamy and geitonogamy are prevented?

Match the placental types (column-I) with their examples (column-II).

Match the column I with column II. Choose the correct match from the options given below:

Prosthetic groups differ from co-enzymes in that-

Crossing over takes place between which chromatids and in which stage of the cell cycle?

"Ramachandran plot" is used to confirm the structure of

Which of the following is not a feature of active transport of solutes in plants?

Which of the following bacteria reduce nitrate in soil into nitrogen?

What will be the direction of flow of water when a plant cell is placed in a hypotonic solution?

Where is the respiratory electron transport system (ETS) located in plants?

Which of the following is against the rules of ICBN?

Mad cow disease in cattle is caused by an organism which has :

Which of the following statements is correct?

Match the organisms in Column I with habitats in Column II. Select the correct answer from the options given below:

In the dicot root the vascular cambium originates from :

Which of the following shows whorled phyllotaxy?

Regeneration of damaged growing grass following grazing is largely due to :

Bicarpellary ovary with obliquely placed septum is seen in :

Select the incorrect statement regarding inbreeding.

A biocontrol agent to be a part of an integrated pest management should be :

Match the following enzymes with their functions: Select the correct option from the following:

The two antibiotic resistance genes on vector pBR322 are for

Exploitation of bioresources of a nation by multinational companies without authorization from the concerned country is referred to as

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-

Decline in the population of Indian native fishes due to introduction of Clarias gariepinus in river Yamuna can be categorised as

Match the following RNA polymerases with their transcribed products: Select the correct option from the following :

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?

A population of a species invades a new area. Which of the following condition will lead to Adaptive Radiation?

Identify A, B and C in the diagrammatic representation of the mechanism of hormone action. Select the correct option from the following:

Humans have acquired immune system that produces antibodies to neutralize pathogens. Still innate immune system is present at the time of birth because it:

Select the correct sequence of events.

Which of the following hormones is responsible for both the milk ejection reflex and the foetal ejection reflex?

No new follicles develop in the luteal phase of the menstrual cycle because:

In Australia, marsupials and placental mammals have evolved to share many similar characteristics. This type of evolution may be referred to as

Match the items of Column-I with Column-II : Select the correct option from the following:

What will be the sequence of mRNA produced by the following stretch of DNA?

Which of the following statements is not correct?

Match the following joints with the bones involved: Select the correct option from the following:

Which of the following diseases is an autoimmune disorder?

Artificial light, extended work-time and reduced sleep-time disrupt the activity of –

Which of the following conditions will stimulate parathyroid gland to release parathyroid hormone?

Which of the following is a correct statement?

Which of the following sexually transmitted diseases do not specifically affect reproductive organs?

Select the correct statement.

The maximum volume of air a person can breathe in after a forced expiration is known as:

All the components of the nodal tissue are autoexcitable. Why does the SA node act as the normal pacemaker?

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:

Match the following parts of a nephron with their function: Select the correct option from the following:

Match the items in Column-I with those in Column-II. Select the correct option from the following:

Which of the following receptors are specifically responsible for maintenance of balance of body and posture?

Which of the following cell organelles is present in the highest number in secretory cells?

Non-membranous nucleoplasmic structures in nucleus are the site for active synthesis of:

Which of the following nucleic acids is present in an organism having 70 S ribosomes only?

After meiosis I, the resultant daughter cells have:

Which of the following organic compounds is the main constituent of Lecithin?

The main difference between active and passive transport across cell membranes is:

Match the items given in Column-I with those in Column-II and choose the correct option.

Kwashiorkor disease is due to:

Match the following genera with their respective phylum: Select the correct option.

Which of the following animals are true coelomates with bilateral symmetry?

The contrasting characteristics generally in a pair used for identification of animals in Taxonomic Key are referred to as:

Match the following cell structure with its characteristic: Select the correct option from the following:

Which of the following statements is INCORRECT?

Following limiting molar conductivities are given as:

A first order reaction has a rate constant of $2.303 \times 10^{-3}\ \text{s}^{-1}$. The time required for $40\ \text{g}$ of this reactant to reduce to $10\ \text{g}$ will be [Given that $\log_{10} 2 = 0.3010$]

For a reaction, activation energy $E_a = 0$ and the rate constant at $200\ \text{K}$ is $1.6 \times 10^6\ \text{s}^{-1}$. The rate constant at $400\ \text{K}$ will be given that gas constant, $R = 8.314\ \text{J K}^{-1}\text{mol}^{-1}$.

The correct option representing a Freundlich adsorption isotherm is:

Which of the following is paramagnetic?

Which of the following is the correct order of dipole moment?

Crude sodium chloride obtained by crystallisation of brine solution does not contain:

Which of the alkali metal chloride $(\mathrm{MCl})$ forms its dihydrate salt $(\mathrm{MCl \cdot 2H_2O})$ easily?

The reaction that does not give benzoic acid as the major product is

The amine that reacts with Hinsberg’s reagent to give an alkali insoluble product is

Which structure(s) of proteins remain(s) intact during denaturation process?

The polymer that is used as a substitute for wool in making commercial fibres is

The artificial sweetener stable at cooking temperature and does not provide calories is

The density of 2 M aqueous solution of NaOH is 1.28 g/cm³. The molality of the solution is [Given that molecular mass of NaOH = 40 g mol⁻¹]

Orbital having 3 angular nodes and 3 total nodes is

In hydrogen atom, the de Broglie wavelength of an electron in the second Bohr orbit is given that Bohr radius $a_0 = 52.9\,\text{pm}$.

The volume occupied by $1.8\,\text{g}$ of water vapour at $374^{\circ}C$ and $1\,\text{bar}$ pressure will be given that $R = 0.083\,\text{bar L K}^{-1}\text{mol}^{-1}$.

Match the oxide given in Column A with its property given in Column B.$$\begin{array}{|c|c|}\hline \text{Column A} & \text{Column B} \\ \hline (i)\; Na_2O & (a)\; \text{Neutral} \\ (ii)\; Al_2O_3 & (b)\; \text{Basic} \\ (iii)\; N_2O & (c)\; \text{Acidic} \\ (iv)\; Cl_2O_7 & (d)\; \text{Amphoteric} \\ \hline \end{array}$$Which of the following options has all correct pairs?

Match the catalyst with the process. Which of the following is the correct option?

The most stable carbocation among the following is

The alkane that gives only one mono-chloro product on chlorination with $Cl_2$ in presence of diffused sunlight is

In the following reaction, The number of sigma $(\sigma)$ bonds present in the product $A$ is:

Aluminium chloride in acidified aqueous solution forms a complex 'A'. In which hybridisation state of Al is 'B'. What are 'A' and 'B', respectively?