Q2 of 67 Page 41

In what way is active transport opposite to diffusion?

Active transport is the passage of substances from its lower concentration to its higher concentration across the semi-permeable membrane using the energy from the cell, whereas, diffusion is the free movement of molecules of a substance from the region of its higher concentration to the region of its lower concentration without the absorption of energy.


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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.

 3

A cell kept in a certain solution bursts after some time. Comment upon the kind of solution.

 4

Which process-diffusion, osmosis of active transport, needs involvement of energy?