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

Question : 21

Consider the following statements :

1. Life can originate on earth from pre-existing life only.
2. The atmosphere of the primitive earth was reducing.

a) Both A and B

b) A only

c) B only

d) Neither A nor B

Question : 22

All are ecosystems except

a) Garden

b) Forest

c) Grassland

d) Sun

Question : 23 [IAS (Pre) 2002]

In the context of organic evolution, the loss of limbs in snakes is explained by the phenomenon of

a) Natural selection

b) Use and disuse of organs

c) Adaptation to living in burrows

d) Inheritance of acquired characters

Question : 24

The taxonomic unit ‘Phylum’ in the classification of animals is equivalent to which hierachial level in classification of plants

a) Division

b) Class

c) Order

d) Family

Question : 25

Which one of the following organisms is not an example of eukaryotic cells ?

a) Euglena viridis

b) Paramoecium caudatum

c) Escherichia coli

d) Amoeba proteus