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Zoology MCQs for NEET — Practice Questions with Answers

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Pneumotaxic Centre is present in the

forebrain

midbrain

Hindbrain

Diencephalon

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Explanation

Refer NCERT, Heading 17.5, para 1, page-275 Pons is a part of Hindbrain.

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Respiratory rhythm Centre is present in the

forebrain

midbrain

Hindbrain

Diencephalon

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Explanation

Refer NCERT, Heading 17.5, para 1, page-275 medulla is a part of Hindbrain.

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Difficulty in breathing due to inflammation of bronchi and bronchioles leads to

Asthma

Emphysema

Occupational Lung Disease

Rhinitis

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Explanation

Refer NCERT, Heading 17.6, page-275.

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Which of the following disease is caused mainly due to cigarette smoking

Asthma

Emphysema

Bronchitis

Rhinitis

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Explanation

Refer NCERT, Heading 17.6, page-275

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In which of the following disease alveolar walls are damaged due to which respiratory surface is decreased

Asthma

Emphysema

Bronchitis

Rhinitis

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Explanation

Refer NCERT, Heading 17.6, page-275.

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One of the factors required for the maturation of erythrocytes is

vitamin - D

vitamin - A

vitamin - B₁₂

vitamin - C

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Explanation

(c) Vitamin-B₁₂ (cobalamin) promotes DNA synthesis, maturation of erythrocytes and myelin formation. Vitamin-D (calciferol), It is necessary for the formation of healthy bones and teeth.

Vitamin-A (retinol), It is necessary for proper body growth and night vision. Vitamin-C (ascorbic acid), It helps in wound healing, blood formation and absorption of iron.

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Oxalates and citrates are used as anticoagulants in stored blood because they:

Chelate calcium ions

Act as competitive inhibitors of vitamin K

Potentiate anti-thrombin III

Activate heparin

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Explanation

1. Each step of blood clotting requires the presence of calcium ions. Non-availability due to chelation will lead to their anti-coagulant effect.

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The inter-atrial septum in the human heart can be best described as:

A thin muscular wall

A thick muscular wall

A thin fibrous tissue

A thick fibrous tissue

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Explanation

Answer: 1

Read page 283, XI NCERT

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The sino-atrial node is the normal pacemaker of the human heart because:

It is located in the right atrium

It is the only part of the conducting system that can generate impulse

It can generate the maximum number of action potentials in the conducting system

It produces action potentials that are more in size than the other parts of the conducting system.

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Explanation

Answer 3. Read page 284, XI NCERT.

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What percentage of ventricular filling is achieved by atrial contraction?

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Explanation

Answer 1. Read page 284, XI NCERT

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