Question

3. Give biological reasons for:

(i) Salt and sugar are used in preserving food.
(ii) Some plants show wilting of their leaves during mid day even when the soil is well watered.
(ii) On sprinkling common salt on grass growing in a lawn, the grass is killed.
(iv) Wilted lettuce leaves if kept in cold water become crisp.​

Answer 1

Answer:

(I) Because they r preservatives

(ii) Because during mid-day the sunlight is too hard

(iii) Because salt is a good weedicide

(iv) Because cold water is denser than hot water...

Answer 2

I) salt and sugar have hypertonic solution which shrink the moisture of food and help in preservation of food.

ii) Some plants show wilting of their leaves during mid day even when the soil is well watered due high rate of transpiration or loss of water.

iii) because salt solution is more concentrated then grass' protoplasm or due to hypertonicity grass is died.

iv) because the root hair absorbs water and become in flaccid state.

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