NEET Practice: Biology 4

1. The process of conversion of glucose into pyruvic acid is called:

(a) Krebs cycle (b) Glycolysis (c) Electron transport chain (d) Fermentation

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Correct Answer: (b) Glycolysis

Explanation:
Glycolysis is the first step in cellular respiration

2. The tissue that provides mechanical support to plants is:

(a) Parenchyma (b) Collenchyma (c) Sclerenchyma (d) Xylem

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Correct Answer: (c) Sclerenchyma

Explanation:
Sclerenchyma has lignified walls for mechanical support

3. The hormone that regulates the menstrual cycle is:

(a) Insulin (b) Thyroxine (c) Estrogen and Progesterone (d) Adrenaline

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Correct Answer: (c) Estrogen and Progesterone

Explanation:
These ovarian hormones control the menstrual cycle

4. The functional unit of the nervous system is:

(a) Nephron (b) Neuron (c) Alveolus (d) Sarcomere

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Correct Answer: (b) Neuron

Explanation:
Neuron transmits nerve impulses

5. The pigment responsible for skin colour is:

(a) Haemoglobin (b) Melanin (c) Chlorophyll (d) Carotene

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Correct Answer: (b) Melanin

Explanation:
Melanin is produced by melanocytes

6. The process of fusion of male and female gametes is called:

(a) Pollination (b) Fertilisation (c) Implantation (d) Gestation

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Correct Answer: (b) Fertilisation

Explanation:
Fertilisation forms the zygote

7. The number of cranial nerves in humans is:

(a) 12 pairs (b) 31 pairs (c) 10 pairs (d) 8 pairs

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Correct Answer: (a) 12 pairs

Explanation:
There are 12 pairs of cranial nerves

8. The tissue that conducts water and minerals in plants is:

(a) Phloem (b) Xylem (c) Parenchyma (d) Collenchyma

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Correct Answer: (b) Xylem

Explanation:
Xylem transports water and minerals upward

9. The hormone secreted by the thyroid gland is:

(a) Insulin (b) Thyroxine (c) Adrenaline (d) Growth hormone

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Correct Answer: (b) Thyroxine

Explanation:
Thyroxine regulates metabolic rate

10. The organ that produces bile is:

(a) Pancreas (b) Liver (c) Stomach (d) Small intestine

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Correct Answer: (b) Liver

Explanation:
Liver produces bile which helps in fat digestion