section 9 MCQ Questions & Answers Detailed Explanation

Question : 1

Consider the following statements.
Assertion (A):
Immune system gets affected by AIDS.
Reason (R):
T-lymphocytes get completely damaged in AIDS.
Select the correct answer using the code given below.
Code

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

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

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

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

Question : 2

Who discovered the polio vaccine?

a) Robert Koach

b) Alexander Flemming

c) Jones Salk

d) Edward Genere

Question : 3

Consider the following statements.

1. Fatty acids should be a part of human diet.
2. A normal diet should contain 75 gm of fat.
3. The cells of human body can not synthesize any fatty acids.
4. Deficiency diseases develop due to the absence of essential fatty acids.

a) Only 2 and 3

b) 1, 2 and 4

c) 1, 2 and 3

d) Only 3 and 4

Question : 4

Who invented vaccine for small pox ?

a) Edward Jener

b) Robert Hooke

c) Robert Koch

d) Louis Pasteur

Question : 5

Nitrogen fixation is a process of

a) absorbing nitrogen from the soil.

b) converting nitrogen in the air to form a usable form by plants.

c) recycling nitrogen from organic matter in the soil.

d) conversion of NO₃ to N₂.

Question : 6

Typhoid and cholera are typical examples of

a) Water borne disease

b) Infectious diseases

c) Airborne diseases

d) None of the above