NEET Practice: Biology 1

1. The basic unit of classification is:

(a) Genus (b) Species (c) Family (d) Order

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Correct Answer: (b) Species

Explanation: Species is the lowest and basic unit of classification in taxonomy.

2. Which of the following is a prokaryote?

(a) Amoeba (b) Paramecium (c) Nostoc (d) Chlamydomonas

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Correct Answer: (c) Nostoc

Explanation:
Nostoc is a cyanobacterium (prokaryote)

3. The site of photosynthesis in plants is:

(a) Mitochondria (b) Chloroplast (c) Ribosome (d) Golgi apparatus

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Correct Answer: (b) Chloroplast

Explanation:
Chloroplast contains chlorophyll and is the site of photosynthesis

4. The structural and functional unit of kidney is:

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

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Correct Answer: (b) Nephron

Explanation:
Nephron is the structural and functional unit of kidney

5. The hormone responsible for milk ejection is:

(a) Prolactin (b) Oxytocin (c) Estrogen (d) Progesterone

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Correct Answer: (b) Oxytocin

Explanation:
Oxytocin causes milk ejection (let-down reflex)

6. The number of chromosomes in human somatic cells is:

(a) 46 (b) 23 (c) 44 (d) 48

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Correct Answer: (a) 46

Explanation:
23 pairs (diploid number)

7. The process of conversion of atmospheric nitrogen into nitrates is called:

(a) Nitrogen fixation (b) Nitrification (c) Denitrification (d) Ammonification

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Correct Answer: (a) Nitrogen fixation

Explanation:
Conversion of N₂ to nitrates by nitrogen-fixing bacteria

8. The powerhouse of the cell is:

(a) Nucleus (b) Mitochondria (c) Ribosome (d) Golgi apparatus

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Correct Answer: (b) Mitochondria

Explanation:
Mitochondria produce ATP through cellular respiration

9. The pigment responsible for photosynthesis is:

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

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Correct Answer: (a) Chlorophyll

Explanation:
Chlorophyll absorbs light energy for photosynthesis

10. The smallest bone in the human body is:

(a) Stapes (b) Malleus (c) Incus (d) Femur

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Correct Answer: (a) Stapes

Explanation:
Stapes is the smallest bone in the middle ear