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Define the Following: Osmosis - Biology

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Question

Define the following:

Osmosis

One Line Answer
Short/Brief Note
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Solution

Osmosis - Osmosis is the movement of solvent molecules from a region of higher concentration to a region of lower concentration through a semi-permeable membrane.

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Chapter 4: Absorption by Roots - Exercise 1 [Page 48]

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Frank Biology II [English] Class 7 ICSE
Chapter 4 Absorption by Roots
Exercise 1 | Q 1.01 | Page 48

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RELATED QUESTIONS

A candidate in order to study the process of osmosis has taken 3 potato cubes and put them in 3 different beakers containing 3 different solutions. After 24 hours, in the first beaker the potato cube increased in size, in the second beaker the potato cube decreased in size and in the third beaker there was no change in the size of the potato cube. The following diagram shows the result of the same experiment:

(i) Give the technical terms of the solutions used in beakers, 1, 2 and 3.
(ii) In beaker 3, the size of the potato cube remains the same. Explain the reason in brief.
(iii) Write the specific feature of the cell sap of root hairs which helps in absorption of water.
(iv) What is osmosis?
(v) How does a cell wall and a cell membrane differ in their permeability?


A plant cell placed in a certain solution got plasmolysed. What was the kind of solution?


Show by a series of diagrams, the change which a plant cell will undergo when placed in
Hypertonic salt solution


Distinguish between the following:

Turgor pressure and osmotic pressure


Name the following:

The pressure with which the molecules of a substance diffuse.


Give Reasons for the following.
It is necessary to maintain a normal osmotic concentration of the blood.


Give Reasons for the following.
On sprinkling common salt on grass growing in a lawn, the grass is killed.


Give Reasons for the following.
Plants begin to die when the excess of soluble fertilizers are added to the soil?


Fill in the Blank
The pressure which develops in the cortical cells of root which force a part of the water upward ____________.


Explain the Term: Exosmosis


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