genetics, evolution of life & ecological biodiversity - Category wise Question and Answer Practice Test with Solutions

genetics, evolution of life & ecological biodiversity PRACTICE TEST [5 - EXERCISES]

set 1

set 2

set 3

set 4

set 5

Question : 1

Group of organisms that closely resemble each other and freely interbreed in nature, constitute a

a) family

b) species

c) genus

d) taxon

Answer: (b)

Question : 2

Which one is linked to evolution?

a) Competition

b) Variation

c) Extinction

d) Reproduction

Answer: (b)

Organic evolution is the process of cumulative change of living populations and the descendant populations of organisms. According to Darwin, variations are differences among individuals.

Variations which help the individual to fit in its surroundings are passed on to the next generation while others disappear. Thus, variation plays an important role in evolution.

Question : 3

A dihybrid condition is

a) Tt rr

b) tt rr

c) tt Rr

d) Tt Rr

Answer: (d)

Dihybrid condition involves simultaneous inheritance of two pairs of mendelian factors or genes.

Question : 4

The primitive atmosphere of earth contained water vapours, hydrogen, ammonia and

a) O2

b) N2

c) CO2

d) CH4

Answer: (d)

The primitive atmosphere of the earth contained : H2 O, H2 , NH3 & CH4 . The ratio was (2 : 2 : 1) of : NH3 , CH4 and hydrogen.

Question : 5 [MPPCS (Pre) 1997]

Darwin’s theory of natural selection is based on

a) Survival of the fittest

b) Over production

c) Struggle for existence and variation

d) All of the above

Answer: (d)

IMPORTANT general science mcq EXERCISES

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