Q5 of 67 Page 41

Can we call diffusion passive transport? If so, how?

Yes, we can call diffusion a type of passive transport. Passive transport is the free movement of molecules from their higher concentration to their lower concentration, without the involvement of energy, which is the same as diffusion.


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

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

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Name the follow:

(i) The state of a cell when it cannot accommodate any more water ………………..


(ii) Pressure of the cell contents on the cell wall. ………………….


(iii) The part of a plant cell which is like the leather casing of a football ……………………


(iv) The condition that is opposite to turgid. …………………


(v) The state of a plasmolysed cell after the re-entry of water ………………………


(vi) The pressure under which water passes from the living cells of a root into xylem …………………….

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Look at Fig 4.15. Why was oil added over water in the test tubes?