Q2 of 67 Page 35

Mention four purposes for which the plants need water.

The four major purposes are-

i. Photosynthesis: water is used as the raw material for glucose synthesis


ii. Transpiration: process by which water is released in the environment in form of vapour for the purpose of cooling in hot weather, for creating suction pressure, etc.


iii. Transportation: water is required as a transport medium which can dissolve substances, such as minerals and sugar, and transport it upwards into the stem or from the leaves to other parts respectively.


iv. Mechanical support: water provides turgidity to plant which is required for the rigidity required by its tissue to remain erect and upright.


More from this chapter

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1

List the three primary functions of root.

 3

Where are the mineral nutrients mostly used in plants?

 4

List their main characteristics of the roots that suit them to draw water from the soil.

 1

Tick-mark the correct statements:

(i) Diffusion is the movement of molecules from a region of their lower concentration to that of a higher one


(ii) Osmosis includes diffusion, but not vice versa.


(iii) Osmosis is unidirectional.


(iv) Exosmosis may cause bursting of a call.


(v) Semi-permeable membrane prevents the Passage of the solute molecules.


(vi) In an experiment on osmosis, if external pressure is applied on a dilute solution, less water will pass into the concentrated solution.