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NEET Practice Questions (MCQs) with Answers & Solutions

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All Physics Chemistry Botany Zoology

NEET 2023

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Main steps in the formation of Recombinant DNA are given below. Arrange these steps in a correct sequence:

A. Insertion of recombinant DNA into the host cell. B. Cutting of DNA at specific location by restriction enzyme. C. Isolation of desired DNA fragment. D. Amplification of gene of interest using PCR.

A. B, C, D, A B. C, A, B, D C. C, B, D, A D. B, D, A, C

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Explanation

Isolate → Cut → Amplify → Insert: C, B, D, A.

NEET 2023

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Statement I: Gause's 'Competitive Exclusion Principle' states that two closely related species competing for the same resources cannot co-exist indefinitely and competitively inferior one will be eliminated eventually. Statement II: In general, carnivores are more adversely affected by competition than herbivores.

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

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Explanation

Both true per NCERT (carnivores at higher trophic levels are more sensitive to competition).

NEET 2023

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Match List I with List II:

List I	List II
A. Oxidative decarboxylation	I. Citrate synthase
B. Glycolysis	II. Pyruvate dehydrogenase
C. Oxidative phosphorylation	III. Electron transport system
D. Tricarboxylic acid cycle	IV. EMP pathway

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

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Explanation

A-II (PDH), B-IV (EMP), C-III (ETS), D-I (citrate synthase = first enzyme of TCA).

NEET 2023

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Which one of the following statements is NOT correct?

A. The micro-organisms involved in biodegradation of organic matter in a sewage polluted water body consume a lot of oxygen causing the death of aquatic organisms. B. Algal blooms caused by excess of organic matter in water improve water quality and promote fisheries. C. Water hyacinth grows abundantly in eutrophic water bodies and leads to an imbalance in the ecosystem dynamics of the water body. D. The amount of some toxic substances of industrial waste water increases in the organisms at successive trophic levels.

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Explanation

Algal blooms DETERIORATE water quality (block sunlight, deplete O₂); option B is wrong.

NEET 2023

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Match List I with List II:

List I	List II
A. M Phase	I. Proteins are synthesized
B. G₂ Phase	II. Inactive phase
C. Quiescent stage	III. Interval between mitosis and initiation of DNA replication
D. G₁ Phase	IV. Equational division

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

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Explanation

M phase = equational division; G₂ = proteins synth; Quiescent = inactive (G₀); G₁ = between M and S.

NEET 2023

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In which blood corpuscles, the HIV undergoes replication and produces progeny viruses?

A. T_H cells B. B-lymphocytes C. Basophils D. Eosinophils

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Explanation

HIV infects and replicates inside helper T (T_H / CD4⁺) cells.

NEET 2023

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Which of the following is not a cloning vector?

A. BAC B. YAC C. pBR322 D. Probe

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Explanation

Probe is a labelled DNA/RNA fragment used for detection, not a cloning vector.

NEET 2023

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Once the undigested and unabsorbed substances enter the caecum, their backflow is prevented by:

A. Sphincter of Oddi B. Ileo-caecal valve C. Gastro-oesophageal sphincter D. Pyloric sphincter

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Explanation

The ileo-caecal valve prevents backflow from the caecum into the ileum.

NEET 2023

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Match List I with List II:

List I	List II
A. P-wave	I. Beginning of systole
B. Q-wave	II. Repolarisation of ventricles
C. QRS complex	III. Depolarisation of atria
D. T-wave	IV. Depolarisation of ventricles

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

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Explanation

P → atrial depol; Q → start of systole; QRS → ventricular depol; T → ventricular repol.

NEET 2023

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A: Amniocentesis for sex determination is one of the strategies of Reproductive and Child Health Care Programme. R: Ban on amniocentesis checks increasing menace of female foeticide.

A. Both A and R are true and R is the correct explanation of A. B. Both A and R are true and R is NOT the correct explanation of A. C. A is true but R is false. D. A is false but R is true.

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Explanation

Amniocentesis for sex determination is LEGALLY BANNED in India, not promoted. R is true.

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