set 4 MCQ Questions & Answers Detailed Explanation

Question : 1

A biogeographic region with significant reservoir of biodiversity that is under threat from humans is called as

a) biodiversity reservoir

b) bioendangered region

c) biodiversity hotspot

d) environmentally endangered region

Question : 2

Which one of these is not a food chain

a) Plants → Insects → Frog → Snake → Kite

b) Trees → Deer → Lion

c) Plants → Man → Anaconda

d) Small → plants → Crabs → Fish → Swan → bird

Question : 3

What was the most significant trend in evolution of modern man (Homo sapiens) from his ancestors ?

a) Shortening of jaws

b) Binocular vision

c) Upright posture

d) lncreasing brain capacity

Question : 4

Speciation is

a) new environmental ways for existence

b) making of independent species

c) macro evolution

d) all of the above

Question : 5

Which was absent in the atmosphere at the time of origin of life ?

a) H₂

b) O₂

c) NH₃

d) CH₄

Question : 6

The two strands of DNA are held together by

a) phosphodiester bonds

b) hydrogen bonds

c) peptide bonds

d) S – S bonds