Q4 of 67 Page 48

Give reasons for the following:

A plant cell, when kept in a hypertonic salt solution for about 30 minutes, turns flaccid.

This is because a hypertonic solution is a solution whose concentration of salt is very high and when a plant cell is placed in it, exosmosis of water occurs as the cell has a higher concentration of water than the solution in which it is placed. This leads plasmolysis and thus the cell turns flaccid.


More from this chapter

All 67 →
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.

 4

Give reasons for the following:

Potato cubes when placed in water become firm and increase in size.

 5

Mention whether the following statements are true (T) or false (F) and give an explanation in support of your answer.

(a) Plasmolysis is the reverse of deplasmolysis. (T/F)


(b) Guttation is another name for bleeding in plants. (T/F)


(c) Soaked seeds burst their seed coats. (T/F)


(d) If the phloem of a twig is removed keeping the xylem intact, the leaves of a twig wilt. (T/F)


(e) Guttation in plants occurs maximum at mid-day. (T/F)


(f) Dry seeds when submerged in water swell up due to endosmosis. (T/F)