Question

2. Silkworm secrete Fibre made of

a) Cellulose b) Proteins

c) Fat d) Nylon

3. Association of two different organisms in which both are benefited is called

a) Symbiosis b) Nutrition

c) Saprophytic d) parasitic

4. Molecules not move from the hotter body to the colder body in a) conduction b) convection c) radiation d) none of these

5. Plant tissue responsible for transport of water

a) root b) stem

c) Phloem d) Xylem

6. Selective breeding is a process of

a) Selecting offspring with desired properties

b) Selecting parents with desired properties

c) Selecting an area for breeding

d) Selecting fine hair for good quality wool

7. Which of these is not necessary for photosynthesis?

a) Light b) Water

c) Nitrogen d) Chlorophyll

8. Black objects are

a) Good absorbers and bad emitters of heat

b) Good absorbers and good emitters of heat

c) Bad absorbers and good emitters of heat

d)Bad absorbers and bad emitters of heat

Answer 1

Explanation:

1 Explanation. The caterpillar/ silkworm secretes fibre made of a protein which get hardened on being exposed to air and become silk fibre. Silkworm completely covers itself by silk fibres and this covering is called cocoon which is further processed to obtain silk fibres.