Q.I (A) Choose the correct alternatives and rewrite the complete sentences :

1. Resemblance and differences is the result of ..................... .

(a) heredity (b) fertilization

(c) evolution (d) selection

2. The quantity of hormones produced by the plants depends upon the

efficiency of the concerned ..................... .

(a) chromosome (b) enzyme

(c) gene (d) DNA

3. In human beings there are ..................... chromosomes.

(a) 46 (b) 23

(c) 52 (d) 24

4. The theory of natural selection was proposed by ..................... .

(a) Mendel (b) Lamarck

(c) Charles Darwin (d) Robert Hooke

5. A systematic study of fossils and its occurence revealed that the deepest

layers were found to have fossils of ..................... .

(a) vertebrates (b) invertebrates

(c) ambhibians (d) plants

6. ..................... is a connecting link between annelida and arthropoda.

(a) Peripatus (b) Cockroach

(c) Crab (d) Earthworm

7. Inheritance of acquired characteristics is also called .....................

inheritance.

(a) hard (b) soft

(c) acquired (d) crisscross

Answers :

1. heredity 2. enzyme

3. 46 4. Charles Darwin

5. invertebrates 6. Peripatus

7. soft.