Q4 of 67 Page 48

Give reasons for the following:

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

This is because the concentration of the sap in the potato cells is very high and with respect to it, water is a hypotonic solution. This leads to endosmosis of water in the cells when the potato cubes are placed in water, which makes the cells of the potato turgid and thus it becomes firm and increases in size.


More from this chapter

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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:

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

 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)

 1

Give two examples of turgor movements in plants.