set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

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

Question : 2

During the post-fertilisation period the ovules develop into __________ and the ovary matures into a _________.

a) A – flower; B – seed

b) A – seeds; B – fruit

c) A – fruit; B – seeds

d) A – seeds; B – flower

Question : 3

Which one of the following processes of weathering belongs to both mechanical and chemical weathering?

a) Hydration

b) Crystallization

c) Exfoliation

d) Carbonation

Question : 4

A dihybrid condition is

a) Tt rr

b) tt rr

c) tt Rr

d) Tt Rr

Question : 5

Which one is linked to evolution?

a) Competition

b) Variation

c) Extinction

d) Reproduction

Question : 6

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

a) family

b) species

c) genus

d) taxon