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Biology MCQ Practice 13 — Science Foundation Course for Class 11 & 12
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1.
The process by which plants lose water vapour 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 is:
(a) Mitochondria
(b) Centrosome
(c) Ribosome
(d) Golgi apparatus
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Correct Answer: (b) Centrosome
Explanation:
Centrosome organises spindle fibres during cell division
3.
The hormone that controls the rate of metabolism is:
(a) Insulin
(b) Thyroxine
(c) Adrenaline
(d) Growth hormone
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Correct Answer: (b) Thyroxine
Explanation:
Thyroxine regulates basal metabolic rate
4.
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 support
5.
The process of cell division in somatic cells is:
(a) Meiosis
(b) Mitosis
(c) Binary fission
(d) Budding
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Correct Answer: (b) Mitosis
Explanation:
Mitosis maintains chromosome number
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 is the largest gland
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