set 4 MCQ Questions & Answers Detailed Explanation

Question : 1

Which one of the following parts of the human brain is the regulating centre for swallowing and vomiting?

a) Cerebrum

b) Medulla oblongata

c) Cerebellum

d) Pons

Question : 2

Chief function of leaves are

a) respiration and photosynthesis

b) respiration and digestion

c) transpiration and photosynthesis

d) respiration and transpiration

Question : 3

Photosynthetically active radiation is represented by the range of wavelength of

a) 400 – 700 nm

b) 500 – 600 nm

c) 340 – 450 nm

d) 400 – 950 nm

Question : 4

In PS-I the reaction centre Chl a has absorption maxima at _____________, while in PS-II the reaction centre Chl a has absorption maxima at ___________.

a) P₇₀₀, P₆₈₀

b) P₈₀₀, P₆₀₀

c) P₆₈₀, P₇₀₀

d) P₇₀₀, P₉₀₀

Question : 5

Which of the following statements are wrong?

1. Leucocytes disintegrate in the spleen and liver.
2. RBC, WBC and blood platelets are produced in bone marrow.
3. Neutrophils bring about destruction and detoxification of toxins of protein origin.
4. The important function of lymphocytes is to produce antibodies.

a) 1 and 3

b) 1 and 4

c) 1 and 2

d) 2 and 3

Question : 6

Which one of the following organs in the human body is most affected due to shortage of oxygen?

a) Skin

b) Intestine

c) Kidney

d) Brain