set 4 MCQ Questions & Answers Detailed Explanation

Question : 1

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 : 2

In expiration, diaphragm becomes

a) relaxed

b) flattened

c) straightened

d) arched

Question : 3

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 : 4

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

Question : 5

Which element is required in comparatively least quantity for the growth of plant?

a) N

b) P

c) Zn

d) Ca

Question : 6

Bones are mainly made up of

a) calcium and sulphur

b) calcium and phosphorous

c) calcium and magnesium

d) calcium and iron