set 3 MCQ Questions & Answers Detailed Explanation

Question : 1

Thymosin stimulates

a) erythrocytes

b) milk secretion

c) T-lymphocytes

d) melanocytes

Question : 2

Percentage of oxygen supplied by haemoglobin is

a) 100%

b) 97%

c) 49%

d) 3%

Question : 3

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 : 4

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

Question : 5

Appearance of facial hairs in a woman may be due to the effect of

a) ultraviolet radiation

b) temperature

c) hormone

d) pollution

Question : 6

Consider the following statements :

1. They are small, cylindrical, branched and the fibers have broad ends.
2. Special electrical junctions called “intercalated discs” are present at intervals in the fibers.
3. The muscles show undergo contractions.
4. They are involuntary muscle fibers. They are not under the control of one’s will.

a) 1, 2 and 3

b) 2 and 4

c) 1 and 2

d) 1, 2, 3 and 4