Q4 of 67 Page 41

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

Active transport involves the absorption of energy because it is a process in which passage of substances from its lower concentration to its higher concentration takes place, that is, against the concentration gradient.


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2

In what way is active transport opposite to diffusion?

 3

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

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

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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 …………………….