set 4 MCQ Questions & Answers Detailed Explanation

Question : 1

Consider the following statements :

1. A colourblind person cannot distinguish between red and green.
2. Colour blindness is related with a defect in cone cells.

a) 1 and 2

b) 2 only

c) 1 only

d) None

Question : 2

Binomial Nomenclature was given by

a) Carolus Linneaus

b) Lamarck

c) Ernst Mayr

d) Cuvier

Question : 3

The two strands of DNA are held together by

a) phosphodiester bonds

b) hydrogen bonds

c) peptide bonds

d) S – S bonds

Question : 4

The factors which represent the contrasting pairs of characters are called

a) alleles

b) homologous pairs

c) dominant and recessive

d) determinants

Question : 5

Consider the following statements :

1. Human beings have 23 pairs of chromosomes.
2. Sex chromosome in human male are named XY.
3. Chromosomes are best seen in metaphase.

a) 1, 2 and 3

b) 2 and 3

c) 1 and 2

d) None

Question : 6

In class of Amphibia, respiration occurs through

a) skin

b) gills

c) lungs

d) All of these