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NEET NEET Questions — Free MCQ Practice

NEET 2024

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Match List I with List II.

List I (Types of Stamens)	List II (Example)
A. Monoadelphous	I. Citrus
B. Diadelphous	II. Pea
C. Polyadelphous	III. Lily
D. Epiphyllous	IV. China-rose

Choose the correct answer from the options given below:

A. A-III, B-I, C-IV, D-II B. A-IV, B-II, C-I, D-III C. A-IV, B-III, C-II, D-I D. A-I, B-II, C-IV, D-III

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Explanation

Monoadelphous — China rose (one bundle); Diadelphous — Pea; Polyadelphous — Citrus; Epiphyllous — Lily (stamens fused to perianth).

NEET 2024

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The DNA present in chloroplast is:

A. Circular, single stranded B. Linear, double stranded C. Circular, double stranded D. Linear, single stranded

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Explanation

Chloroplast (and mitochondrial) DNA is circular and double-stranded — like prokaryotic DNA.

NEET 2024

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Read the following statements and choose the set of correct statements:

In the members of Phaeophyceae,

A. Asexual reproduction occurs usually by biflagellate zoospores.

B. Sexual reproduction is by oogamous method only.

C. Stored food is in the form of carbohydrates which is either mannitol or laminarin.

D. The major pigments found are chlorophyll a, c and carotenoids and xanthophyll.

E. Vegetative cells have a cellulosic wall, usually covered on the outside by gelatinous coating of algin.

Choose the correct answer from the options given below:

A. A, B, C and E only B. A, B, C and D only C. B, C, D and E only D. A, C, D and E only

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Explanation

Phaeophyceae show isogamous, anisogamous or oogamous reproduction — not only oogamous; B is false.

NEET 2024

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Match List I with List II.

List I	List II
A. Citric acid cycle	I. Cytoplasm
B. Glycolysis	II. Mitochondrial matrix
C. Electron transport system	III. Intermembrane space of mitochondria
D. Proton gradient	IV. Inner mitochondrial membrane

Choose the correct answer from the options given below:

A. A-IV, B-III, C-II, D-I B. A-II, B-I, C-IV, D-III C. A-II, B-I, C-IV, D-III D. A-III, B-IV, C-I, D-II

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Explanation

TCA — matrix; glycolysis — cytoplasm; ETS — inner membrane; H⁺ gradient — intermembrane space.

NEET 2024

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Given below are two statements:

Statement I: In $C_3$ plants, some $O_2$ binds to RuBisCO, hence $CO_2$ fixation is decreased.

Statement II: In $C_4$ plants, mesophyll cells show very little photorespiration while bundle sheath cells do not show photorespiration.

In the light of the above statements, choose the correct answer from the options given below:

A. Statement I is false but Statement II is true B. Both Statement I and Statement II are true C. Both Statement I and Statement II are false D. Statement I is true but Statement II is false

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Explanation

Both standard NCERT facts about C₃/C₄ photorespiration.

NEET 2024

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Which of the following statement is correct regarding the process of replication in E. coli?

A. The DNA dependent DNA polymerase catalyses polymerization in $5' \to 3'$ direction. B. The DNA dependent DNA polymerase catalyses polymerization in one direction that is $3' \to 5'$. C. The DNA dependent RNA polymerase catalyses polymerization in one direction, that is $5' \to 3'$. D. The DNA dependent DNA polymerase catalyses polymerization in $5' \to 3'$ as well as $3' \to 5'$ direction.

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Explanation

All known DNA polymerases extend the new strand strictly in the $5' \to 3'$ direction.

NEET 2024

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Match List I with List II.

List I	List II
A. Robert May	I. Species-Area relationship
B. Alexander von Humboldt	II. Long term ecosystem experiment using out door plots
C. Paul Ehrlich	III. Global species diversity at about 7 million
D. David Tilman	IV. Rivet popper hypothesis

Choose the correct answer from the options given below:

A. A-III, B-I, C-IV, D-II B. A-II, B-III, C-I, D-IV C. A-III, B-I, C-IV, D-II D. A-I, B-III, C-II, D-IV

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Explanation

May — 7 million species; Humboldt — species-area; Ehrlich — rivet-popper; Tilman — long-term plots.

NEET 2024

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Match List I with List II.

List I	List II
A. Frederick Griffith	I. Genetic code
B. Francois Jacob & Jacque Monod	II. Semi-conservative mode of DNA replication
C. Har Gobind Khorana	III. Transformation
D. Meselson & Stahl	IV. Lac operon

Choose the correct answer from the options given below:

A. A-IV, B-I, C-II, D-III B. A-III, B-II, C-I, D-IV C. A-III, B-IV, C-I, D-II D. A-II, B-III, C-IV, D-I

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Explanation

Griffith — transformation; Jacob & Monod — lac operon; Khorana — genetic code; Meselson & Stahl — semi-conservative replication.

NEET 2024

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In an ecosystem if the Net Primary Productivity (NPP) of first trophic level is $100x\,(kcal\,m^{-2})\,yr^{-1}$, what would be the GPP (Gross Primary Productivity) of the third trophic level of the same ecosystem?

A. $\dfrac{100x}{3x}\ (kcal\,m^{-2})\,yr^{-1}$ B. $\dfrac{x}{10}\ (kcal\,m^{-2})\,yr^{-1}$ C. $x\ (kcal\,m^{-2})\,yr^{-1}$ D. $10x\ (kcal\,m^{-2})\,yr^{-1}$

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Explanation

Lindeman's 10 % rule: $100x \to 10x$ (2nd) $\to x$ (3rd).

NEET 2024

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Match List I with List II.

List I	List II
A. Rose	I. Twisted aestivation
B. Pea	II. Perigynous flower
C. Cotton	III. Drupe
D. Mango	IV. Marginal placentation

Choose the correct answer from the options given below:

A. A-II, B-III, C-IV, D-I B. A-II, B-IV, C-I, D-III C. A-I, B-II, C-III, D-IV D. A-IV, B-III, C-II, D-I

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Explanation

Rose — perigynous; Pea — marginal placentation; Cotton — twisted aestivation; Mango — drupe.

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