Question : (a) why do plants have variously coloured flowers ? Give two reasons. (b) Why do certain flowers emit aroma ? How does aroma of flowers spread in the environment ? (c) In the following examples, name the phenomenon involved when : (i) exchange of gases occur across the respiratiory surface. (ii) aroma spreads in the house when your mother cooks food in the kitchen.

Question : (a) why do plants have variously coloured flowers ? Give tw

1.	Question : (a) why do plants have variously coloured flowers ? Give two reasons. (b) Why do certain flowers emit aroma ? How does aroma of flowers spread in the environment ? (c) In the following examples, name the phenomenon involved when : (i) exchange of gases occur across the respiratiory surface. (ii) aroma spreads in the house when your mother cooks food in the kitchen.
Answer» Solution :(a) (i) Plants have flowers to attract insects and other animals for POLLINATION. (ii) The flowers are responsible for SEXUAL REPRODUCTION in plants. (b) Flowers of certain plants emit aroma in the enviroment to attract insects and other animals for pollination. The aroma SPREADS from flowers into the surrounding medium by 'DIFFUSION'. (c) (i) Diffusion(ii) Diffusion