NEET 2013
Previous Year Questions

Select the wrong statement:

Which one of the following is not a correct statement?

Isogamous condition with non-flagellated gametes is found in

Besides paddy fields, cyanobacteria are also found inside vegetative part of

Megasporangium is equivalent to

Read the following statements (A–E) and answer the question that follows them: (A) In liverworts, mosses and ferns gametophytes are free-living. (B) Gymnosperms and some ferns are heterosporous. (C) Sexual reproduction in Fucus, Volvox and Albugo is oogamous. (D) The sporophyte in liverworts is more elaborate than that in mosses. (E) Both Pinus and Marchantia are dioecious. How many of the above statements are correct?

Among bitter gourd, mustard, brinjal, pumpkin, china rose, lupin, cucumber, sunflower, gram, guava, bean, chilli, plum, petunia, tomato, rose, withania, potato, onion, aloe and tulip how many plants have hypogynous flowers?

Interfascicular cambium develops from the cells of

In China rose the flowers are

Lenticels are involved in

Age of a tree can be estimated by

Seed coat is not thin, membranous in

Transition state structure of the substrate formed during an enzymatic reaction is

A phosphoglyceride is always made up of

Pigment-containing membranous extensions in some cyanobacteria are

A major site for synthesis of lipids is

The complex formed by a pair of synapsed homologous chromosomes is called

The three boxes in this diagram represent the three major biosynthetic pathways in aerobic respiration. Arrows represent net reactants or products. Arrows numbered 4, 8, and 12 can all be

The most abundant intracellular cation is

During seed germination its stored food is mobilized by

Which of the following criteria does not pertain to facilitated transport?

The first stable product of fixation of atmospheric nitrogen in leguminous plants is

Which of the metabolites is common to respiration-mediated breakdown of fats, carbohydrates and proteins?

Which one of the following statements is correct?

Product of sexual reproduction generally generates

Meiosis takes place in

Advantage of cleistogamy is

Monoecious plant of Chara shows occurrence of

Perisperm differs from endosperm in

Which of the following statements is not true of two genes that show 50% recombination frequency?

Variation in gene frequencies within populations can occur by chance rather than by natural selection. This is referred to as

If two persons with AB blood group marry and have sufficiently large number of children, the blood groups observed are $A:B:AB = 1:2:1$. Modern electrophoresis reveals presence of both A and B type proteins in AB blood group individuals. This is an example of

The process by which organisms with different evolutionary history evolve similar phenotypic adaptations in response to a common environmental challenge is called

The tendency of population to remain in genetic equilibrium may be disturbed by

Which of the following Bt crops is being grown in India by farmers?

A good producer of citric acid is

DNA fragments generated by restriction endonucleases in a chemical reaction can be separated by

Which of the following is not correctly matched for the organism and its cell wall degrading enzyme?

The colonies of recombinant bacteria appear white in contrast to blue colonies of non-recombinant bacteria because of

Which of the following are likely to be present in deep sea water?

Natural reservoir of phosphorus is

Secondary productivity is rate of formation of new organic matter by

Which one of the following is not used for ex situ plant conservation?

Kyoto Protocol was endorsed at

Which of the following represent maximum number of species among global biodiversity?

Match the name of the animal (Column I) with one characteristic (Column II) and the phylum/class (Column III) to which it belongs.

Which of the following are correctly matched with respect to their taxonomic classification?

Which group of animals belong to the same phylum?

One of the representatives of phylum Arthropoda is

The H-zone in skeletal muscle fibre is due to

What external changes are visible after the last moult of a cockroach nymph?

The Golgi complex plays a major role

Which one of the following organelle in the figure correctly matches with its function?

Macromolecule chitin is

The essential chemical components of many coenzymes are

A stage in cell division is shown in the figure. Select the answer which gives correct identification of the stage with its characteristics.

Select the correct match of the digested products in humans given in column I with their absorption site and mechanism in column II.

A pregnant female delivers a baby who suffers from stunted growth, mental retardation, low intelligence quotient and abnormal skin. This is the result of

The figure shows a diagrammatic view of human respiratory system with labels A, B, C and D. Select the option which gives correct identification and main function and/or characteristic.

Figure shows schematic plan of blood circulation in humans with labels A to D. Identify the label and give its function.

The diagram given here is the standard ECG of a normal person. The P-wave represents

Figure shows human urinary system with structures labelled A to D. Select option which correctly identifies them and gives their characteristics and/or functions.

Select the correct statement with respect to locomotion in humans.

The characteristics and an example of a synovial joint in humans is

A diagram showing axon terminal and synapse is given. Identify correctly at least two of A–D.

Parts A, B, C and D of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions/characteristics.

Which of the following statement is correct in relation to the endocrine system?

Select the answer which correctly matches the endocrine gland with the hormone it secretes and its function/deficiency symptom.

What is the correct sequence of sperm formation?

Menstrual flow occurs due to lack of

Which one of the following is not the function of placenta?

One of the legal methods of birth control is

Which of the following cannot be detected in a developing foetus by amniocentesis?

Artificial insemination means

Which Mendelian idea is depicted by a cross in which the F₁ generation resembles both the parents?

The incorrect statement with regard to Haemophilia is

If both parents are carriers for thalassemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?

The diagram shows an important concept in the central dogma of DNA. Fill in the blanks A to C correctly.

Which enzyme/s will be produced in a cell in which there is a nonsense mutation in the lac Y gene?

According to Darwin, the organic evolution is due to

The eye of octopus and eye of cat show different patterns of structure, yet they perform similar function. This is an example of

Infection of Ascaris usually occurs by

The cell-mediated immunity inside the human body is carried out by

In plant breeding programmes, the entire collection of plants/seeds having all the diverse alleles for all genes in a given crop is called

During sewage treatment, biogas is produced which include

A biologist studied the population of rats in a barn. Average natality was 250, mortality 240, immigration 20 and emigration 30. The net increase in population is

Which one of the following processes during decomposition is correctly described?

A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is

Global warming can be controlled by

The Air (Prevention and Control of Pollution) Act came into force in

What is the activation energy for a reaction if its rate doubles when the temperature is raised from $20^\circ C$ to $35^\circ C$? $(R = 8.314\,J\,mol^{-1}K^{-1})$

A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the platinum wire at one atmosphere pressure. The oxidation potential of the electrode would be

A reaction having equal energies of activation for forward and reverse reactions has

At $25^\circ C$ molar conductance of $0.1$ molar aqueous solution of ammonium hydroxide is $9.54\,ohm^{-1}\,cm^2\,mol^{-1}$ and at infinite dilution its molar conductance is $238\,ohm^{-1}\,cm^2\,mol^{-1}$. The degree of ionisation of ammonium hydroxide at the same concentration and temperature is

Based on equation $$E=-2.178\times10^{-18}J\left(\frac{Z^2}{n^2}\right)$$ certain conclusions are written. Which of them is not correct?

A button cell used in watches functions as follows: $$Zn(s)+Ag_2O(s)+H_2O(l) \rightleftharpoons 2Ag(s)+Zn^{2+}(aq)+2OH^{-}(aq)$$ If half-cell potentials are: $$Zn^{2+}(aq)+2e^- \rightarrow Zn(s),\ E^\circ=-0.76V$$ $$Ag_2O(s)+H_2O(l)+2e^- \rightarrow 2Ag(s)+2OH^-(aq),\ E^\circ=0.34V$$ The cell potential will be

How many grams of concentrated nitric acid solution should be used to prepare $250\,mL$ of $2.0\,M\;HNO_3$? The concentrated acid is $70\%\;HNO_3$.

The number of carbon atoms per unit cell of diamond unit cell is

Maximum deviation from ideal gas is expected from

A metal has an fcc lattice. The edge length of the unit cell is $404\,pm$. The density of the metal is $2.72\,g\,cm^{-3}$. The molar mass of the metal is ($N_A=6.02\times10^{23}\,mol^{-1}$)

Dipole-induced dipole interactions are present in which of the following pairs?

A magnetic moment of $1.73\,BM$ will be shown by one among the following

Roasting of sulphide ores gives the gas X as a by-product. This is a colourless gas with choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic and acts as reducing agent. The gas X is

Which is the strongest acid in the following?

Which of the following is paramagnetic?

Which of the following structure is similar to graphite?

The basic structural unit of silicates is