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Zoology MCQs for NEET — Practice Questions with Answers

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NEET 2024

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Given below are two statements:

Statement I: In the nephron, the descending limb of loop of Henle is impermeable to water and permeable to electrolytes.

Statement II: The proximal convoluted tubule is lined by simple columnar brush border epithelium and increases the surface area for reabsorption.

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

Descending limb is permeable to water and impermeable to electrolytes (the opposite of what is claimed) — Statement I is false. PCT lining is correct.

NEET 2024

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Match List I with List II:

List I	List II
A. Common cold	I. Plasmodium
B. Haemozoin	II. Typhoid
C. Widal test	III. Rhinoviruses
D. Allergy	IV. Dust mites

Choose the correct answer from the options given below:

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

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Explanation

Common cold — rhinoviruses; haemozoin — malarial pigment from Plasmodium; Widal test — typhoid; dust mites trigger allergy.

NEET 2024

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Match List I with List II:

List I	List II
A. Expiratory capacity	I. Expiratory reserve volume + Tidal volume + Inspiratory reserve volume
B. Functional residual capacity	II. Tidal volume + Expiratory reserve volume
C. Vital capacity	III. Tidal volume + Inspiratory reserve volume
D. Inspiratory capacity	IV. Expiratory reserve volume + Residual volume

Choose the correct answer from the options given below:

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

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Explanation

EC = TV + ERV; FRC = ERV + RV; VC = IRV + TV + ERV; IC = TV + IRV.

NEET 2024

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Match List I with List II:

List I (Sub Phases of Prophase I)	List II (Specific characters)
A. Diakinesis	I. Synaptonemal complex formation
B. Pachytene	II. Completion of terminalisation of chiasmata
C. Zygotene	III. Chromosomes look like thin threads
D. Leptotene	IV. Appearance of recombination nodules

Choose the correct answer from the options given below:

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

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Explanation

Leptotene — thin threads; Zygotene — synapsis (SC); Pachytene — recombination nodules; Diakinesis — terminalisation of chiasmata.

NEET 2024

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Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R:

Assertion A: Breast-feeding during initial period of infant growth is recommended by doctors for bringing a healthy baby.

Reason R: Colostrum contains several antibodies absolutely essential to develop resistance for the new born baby.

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

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

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Explanation

Colostrum is rich in IgA — passive immunity for the neonate; R explains the medical recommendation in A.

NEET 2024

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Which one of the following factors will not affect the Hardy-Weinberg equilibrium?

A. Constant gene pool B. Genetic recombination C. Genetic drift D. Gene migration

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Explanation

"Constant gene pool" describes the equilibrium itself — it does not perturb it. The other three (recombination, drift, migration) are factors that can disturb H-W equilibrium.

NEET 2024

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Match List I with List II:

List I	List II
A. Typhoid	I. Fungus
B. Leishmaniasis	II. Nematode
C. Ringworm	III. Protozoa
D. Filariasis	IV. Bacteria

Choose the correct answer from the options given below:

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

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Explanation

Typhoid — bacterium (Salmonella); Leishmaniasis — protozoan; Ringworm — fungus; Filariasis — nematode.

NEET 2024

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Given below are some stages of human evolution. Arrange them in correct sequence (Past to Recent):

A. Homo habilis B. Homo sapiens C. Homo neanderthalensis D. Homo erectus

Choose the correct sequence of human evolution from the options given below:

A. A-D-C-B B. D-A-C-B C. B-A-D-C D. C-B-D-A

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Explanation

Past → Recent: H. habilis → H. erectus → H. neanderthalensis → H. sapiens.

NEET 2024

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The following diagram showing restriction sites in E.coli cloning vector pBR322. Find the role of 'X' and 'Y' genes:

A. Gene 'X' is responsible for recognition sites and 'Y' is responsible for antibiotic resistance. B. The gene 'X' is responsible for resistance to antibiotics and 'Y' for protein involved in the replication of Plasmid. C. The gene 'X' is responsible for controlling the copy number of the linked DNA and 'Y' for protein involved in the replication of Plasmid. D. The gene 'X' is for protein involved in replication of Plasmid and 'Y' for resistance to antibiotics.

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Explanation

On the NCERT pBR322 map, X (rop) codes for a protein involved in plasmid replication; Y (tet) confers tetracycline resistance.

NEET 2024

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Which of the following factors are favourable for the formation of oxyhaemoglobin in alveoli?

A. Low $pCO_2$ and High temperature B. High $pO_2$ and High $pCO_2$ C. High $pO_2$ and Lesser $H^+$ concentration D. Low $pCO_2$ and High $H^+$ concentration

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Explanation

High $pO_2$, low $pCO_2$, low $H^+$ (high pH) and low temperature shift the Hb-O₂ curve left, favouring oxyhaemoglobin formation in alveoli.

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