Question

Q3. Give reasons for the following:
a) A piece of sponge becomes heavy when dipped in water.
b) A metal chair kept in sun becomes hot.
c) Aquatic plants and animals are able to survive in water.

Answer 1

Answer:

a... as its density increases

b...as metal is good conductor of heat

c...as water contains dissolved oxygen

Answer 2

Explanation:

A.sponge has pore like substance that absorb water

B.As chair is made up of metal it gets heat up fast. Metals are good conductors that it absorb heat very late and release heat slowly

C.Many of the aquatic animals have gills they are able to take the dissolved oxygen which is present in the water.Aquatic plants does not have root cap it will have root pockets because that it survive in water