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Biology MCQ Practice 18 — Science Foundation Course for Class 11 & 12
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1.
The process of water absorption by roots is mainly through:
(a) Active transport
(b) Osmosis
(c) Diffusion
(d) Imbibition
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Correct Answer: (b) Osmosis
Explanation:
Water moves by osmosis from soil to root cells
2.
The organelle that contains its own DNA is:
(a) Ribosome
(b) Mitochondria
(c) Golgi apparatus
(d) Lysosome
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Correct Answer: (b) Mitochondria
Explanation:
Mitochondria have their own circular DNA
3.
The hormone that increases blood sugar level is:
(a) Insulin
(b) Glucagon
(c) Thyroxine
(d) Adrenaline
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Correct Answer: (b) Glucagon
Explanation:
Glucagon raises blood glucose by glycogenolysis
4.
The tissue that conducts water 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
5.
The process of cell division that maintains chromosome number 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 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
Show Answer & Explanation
Correct Answer: (b) Nephron
Explanation:
Nephron filters blood and forms urine