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Biology MCQ Practice 25 — Science Foundation Course for Class 11 & 12
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1.
The smallest unit of classification is:
(a) Genus
(b) Species
(c) Family
(d) Order
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Correct Answer: (b) Species
Explanation:
Species is the basic and smallest unit of classification
2.
The cell organelle responsible for photosynthesis is:
(a) Mitochondria
(b) Chloroplast
(c) Ribosome
(d) Lysosome
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Correct Answer: (b) Chloroplast
Explanation:
Chloroplast contains chlorophyll for photosynthesis
3.
The hormone secreted by the pancreas that lowers blood sugar is:
(a) Glucagon
(b) Insulin
(c) Adrenaline
(d) Thyroxine
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Correct Answer: (b) Insulin
Explanation:
Insulin decreases blood glucose level
4.
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
5.
The process of cell division that reduces chromosome number 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 in blood
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 and 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 for photosynthesis
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