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(a) why do plants have variously coloure...

(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.

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(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
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Arvind sometimes go for late evening walk with his father who has a background of biology. While walking in the colony park, he observed many plants having colour flowers. He also saw few plants having white flowers. Most of these flowers emit pleasant fragrance (=aroma). out of curiousty, Arvind asked his futher the following questions: (i) Why do plants have variously coloured folowers ? GIve two reasons. (ii) Why do certain flowers emit fragrance ? How does fragrance of flowers sperad in the environment ? (iii) Which scientific phenomenon is involved when (a) fragrance spreads in the house at the time of coking of food in the kitchen, (b) exchange of gases occurs acorss the respiratory surface.

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