Gate Way To CGL Mains : Biology Quiz

1.DNA molecules are composed of deoxyribonucleotides of

A.adenine and guanine

B.adenine, guanine and cytosine

C.adenine, guanine, cytosine and thymine

D.none of the above

2.DNA multiplication is concerned with

A.mutton

B.cistron

C.operon

D.replicon

3.DNA nucleotides are attached by

A.hydrogen bonds

B.covalent bonds

C.Vander Wall’s force

D.Electrovalent bonds

4.The pacemaker of heart is

A.Bundle of His

B.S A node

C.AV node

D.Purkinje fibres

5.Doctors recommend that we should cook our food in oil rather than in vanaspati ghee. Why?

A.Oil contains saturated fats.

B.Oil contains unsaturated fats.

C.Oil makes food tasty.

D.Vanaspati ghee is difficult to digest.

6.Dodder (cuscuta), mistletoe (Loranthus) and rafflesia are all

A.parastic animals

B.parasitic plants

C.xerophytic plants

D.epiphytic plants

7.Ductless glands are known as

A. exocrine glands

B.endocrine glands

C.tubular glands

D.alveolar glands

8.Duodenum is a part of

A.brain

B.intestines

C.liver

D.lungs

9.During elections a permanent, chemical mark is put at the base of the nail of index finger while exercising your franchise. This mark is not seen after two months or so because

A.it is worn out by constant washing with scup and water

B.constant contact of the hands with hard water corrodes the mark

C.the formation of new nail forcibly removes the old one

D.it is gradually oxidized by tannin and caffein that we ingest in tea and coffee, respectively

10.During the day time plants

A.take in oxygen and give out carbon dioxide

B.take in carbon dioxide and give out oxygen

C.take in nitrogen and give out oxygen

D.take in carbon dioxide and give out nitrogen

ANSWER KEY:
1 - (C)
2 - (D)
3 - (B)
4 - (B)
5 - (A)
6 - (B)
7 - (B)
8 - (B)
9 - (D)
10- (B)