Q4 of 67 Page 48

Give reasons for the following:

If you sprinkle some common salt on grass growing on a lawn, it is killed at that spot.

If you sprinkle some common salt on grass growing on a lawn, it is killed at that spot.

The reason is that because when salt is added in the soil the concentration of the soil around the roots of the grass increases. This leads to exosmosis of water from the root hair cells of the grasses leading to plasmolysis and finally death.


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2

(a) Mention whether the following statements are true (T) or false (F).

(i) A plant cell placed in hypotonic solution gets plasmolysed. (T/F)


(ii) Addition of salt to pickles prevents growth of bacteria because they turn turgid. (T/F)


(iii) Cells that have lost their water content are said to be deplasmolysed. (T/F)


(iv) Xylem is the water conducting tissue in plants. (T/F)


(v) The shrinkage of protoplasm, when a cell is kept in hypotonic solution. (T/F)


(vi)The cell wall of the root cell is a differentially permeable membrane. (T/F)


(b) Correct the false statements by altering the last word only.

 3

What is the difference between 'flaccid' and 'turgid"? Give one example of flaccid condition in plants.

 4

Give reasons for the following:

If you uproot a plant from the soil, its leaves soon wilt.

 4

Give reasons for the following:

It is better to transplant seedlings in a flower-bed in the evening and not in the morning.