TOP
Main page
Books
Next
Biology MCQ Practice 7 — Science Foundation Course for Class 11 & 12
Answers
Score
Reset
1.
The process of uptake of minerals by roots against concentration gradient is called:
(a) Diffusion
(b) Osmosis
(c) Active transport
(d) Passive transport
Show Answer & Explanation
Correct Answer: (c) Active transport
Explanation:
Active transport requires energy (ATP)
2.
The site of light reaction in photosynthesis is:
(a) Stroma
(b) Grana
(c) Cytoplasm
(d) Mitochondria
Show Answer & Explanation
Correct Answer: (b) Grana
Explanation:
Light reaction occurs in thylakoid membranes (grana)
3.
The hormone secreted by the adrenal medulla is:
(a) Insulin
(b) Adrenaline
(c) Thyroxine
(d) Oxytocin
Show Answer & Explanation
Correct Answer: (b) Adrenaline
Explanation:
Adrenaline prepares the body for fight or flight
4.
The functional unit of the nervous system is:
(a) Nephron
(b) Neuron
(c) Alveolus
(d) Sarcomere
Show Answer & Explanation
Correct Answer: (b) Neuron
Explanation:
Neuron transmits nerve impulses
5.
The pigment that gives colour to human skin is:
(a) Haemoglobin
(b) Melanin
(c) Chlorophyll
(d) Carotene
Show Answer & Explanation
Correct Answer: (b) Melanin
Explanation:
Melanin is produced by melanocytes
6.
The process of formation of gametes is called:
(a) Mitosis
(b) Gametogenesis
(c) Fertilisation
(d) Implantation
Show Answer & Explanation
Correct Answer: (b) Gametogenesis
Explanation:
Gametogenesis produces haploid gametes
7.
The number of pairs of spinal nerves in humans is:
(a) 12
(b) 31
(c) 10
(d) 8
Show Answer & Explanation
Correct Answer: (b) 31
Explanation:
There are 31 pairs of spinal nerves
8.
The tissue that provides flexibility to plants is:
(a) Parenchyma
(b) Collenchyma
(c) Sclerenchyma
(d) Xylem
Show Answer & Explanation
Correct Answer: (b) Collenchyma
Explanation:
Collenchyma has thickened corners for flexibility
9.
The hormone that regulates blood calcium level is:
(a) Thyroxine
(b) Parathyroid hormone
(c) Insulin
(d) Adrenaline
Show Answer & Explanation
Correct Answer: (b) Parathyroid hormone
Explanation:
PTH increases blood calcium level
10.
The largest part of the brain is:
(a) Cerebellum
(b) Cerebrum
(c) Medulla oblongata
(d) Hypothalamus
Show Answer & Explanation
Correct Answer: (b) Cerebrum
Explanation:
Cerebrum controls voluntary actions and higher functions