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Biology MCQ Practice 28 — Science Foundation Course for Class 11 & 12
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1.
The process by which plants lose water vapour from leaves is called:
(a) Respiration
(b) Transpiration
(c) Photosynthesis
(d) Translocation
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Correct Answer: (b) Transpiration
Explanation:
Transpiration is the loss of water vapour from leaves
2.
The organelle that helps in cell division by forming spindle fibres is:
(a) Mitochondria
(b) Centrosome
(c) Ribosome
(d) Golgi apparatus
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Correct Answer: (b) Centrosome
Explanation:
Centrosome organises microtubules for spindle formation
3.
The hormone that regulates calcium level in blood is:
(a) Thyroxine
(b) Parathyroid hormone
(c) Insulin
(d) Adrenaline
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Correct Answer: (b) Parathyroid hormone
Explanation:
PTH increases blood calcium level
4.
The tissue that conducts food in plants is:
(a) Xylem
(b) Phloem
(c) Parenchyma
(d) Collenchyma
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Correct Answer: (b) Phloem
Explanation:
Phloem transports organic food
5.
The process of cell division in gamete formation is:
(a) Mitosis
(b) Meiosis
(c) Binary fission
(d) Budding
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Correct Answer: (b) Meiosis
Explanation:
Meiosis produces haploid gametes
6.
The respiratory pigment in human blood is:
(a) Myoglobin
(b) Haemoglobin
(c) Chlorophyll
(d) Haemocyanin
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Correct Answer: (b) Haemoglobin
Explanation:
Haemoglobin transports oxygen
7.
The basic unit of heredity is:
(a) Chromosome
(b) Gene
(c) DNA
(d) Nucleus
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Correct Answer: (b) Gene
Explanation:
Gene is the unit of heredity
8.
The largest gland in the human body is:
(a) Pancreas
(b) Liver
(c) Thyroid
(d) Pituitary
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Correct Answer: (b) Liver
Explanation:
Liver performs many metabolic functions
9.
The pigment responsible for photosynthesis is:
(a) Haemoglobin
(b) Chlorophyll
(c) Melanin
(d) Carotene
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Correct Answer: (b) Chlorophyll
Explanation:
Chlorophyll absorbs light energy
10.
The functional unit of the kidney is:
(a) Neuron
(b) Nephron
(c) Alveolus
(d) Sarcomere
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Correct Answer: (b) Nephron
Explanation:
Nephron filters blood and forms urine