set 3 MCQ Questions & Answers Detailed Explanation

Question : 1

Growth is primarily affected by two climatic factors which are –

a) Temperature and relative humidity

b) Light and wind

c) Light and temperature

d) Rainfall and temperature

Question : 2

The pH of blood is

a) between 2-4

b) between 7-8

c) between 12-14

d) between 2-5

Question : 3

Respiration in plants

a) results in the formation of vitamins

b) is characteristic of all living cells

c) occurs only during day

d) often requires CO₂

Question : 4

Thymosin stimulates

a) erythrocytes

b) milk secretion

c) T-lymphocytes

d) melanocytes

Question : 5

Other function performed by kidney apart from excretion is

a) Temperature regulation

b) Osmoregulation

c) Hormonal regulation

d) Spermatogenesis

Question : 6

Consider the following statements.
Assertion (A):
During sleep, bright light is undesirable.
Reason (R):
In bright light, production of melatonin in the body is considerably increased.
Select your answer using the codes given below.
Code

a) Both (A) and (R) are true, but (R) is not the correct explanation of (A)

b) (A) is true, but (R) is false

c) Both (A) and (R) are true and (R) is the correct explanation of (A)

d) (A) is false, but (R) is true