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Account for the following briefly: 

(i) The pituitary gland is known as the ‘Master gland’. 

(ii) Animals owe their existence to Chlorophyll. 

(iii) Twins may or may not be identical. 

(iv) Herbaceous plants growing in well watered soils are found to wilt on a hot day. 

(v) Throat infections can lead to ear infections.

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(i) Pituitary gland is popularly known as ‘Master gland’ as it seems to control all other endocrine gland. 

(ii) Animals owe their existence to chlorophyll as animals are hetrotrophs. Animals derive their food from plant and plants can prepare their food with the help of chlorophyll by the process of photosynthesis. 

(iii) Twins may not be identical as in the case of fraternal twins which are produced from two eggs. In this two eggs are released from ovaries at a time and both may get fertilized to produce two individuals. 

(iv) Herbaceous plants growing in well watered soils are found to wilt on a hot day. It is due to the fact that in such cases the rate of transpiration during day time exceeds the rate’of-absorption of water by the roots. The cells therefore lose turgidity. In the evening or during night, the stomata are constricted and the temperature is not high; therefore there is no loss of water through transpiration and the turgidity of the leaves is re-acquired and they stand out erect. 

(v) Throat infection can lead to ear infection as both throat and ear are connected with each other by Eustachian tube.

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