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Question
Explain the term:
Diffusion
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Solution
- Diffusion means to disperse.
- Diffusion can be defined as the movement of ions/ atoms/ molecules of a substance from the region of their higher concentration to the region of their lower concentration till equilibrium is reached.
- The movement is due to the kinetic energy of the molecules.
- Water passes into the cell by diffusion through a freely permeable cell wall.
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?
Complete the following statements:
Hypotonic solution is one in which the solution kept outside the cell has lower solute concentration than ……………… the cell.
(a) Mention whether the following statement is true (True) or false (False)
(b) Correct the false statement by altering the last word only.
A plant cell placed in hypotonic solution gets Plasmolysed.
Leaves of the sensitive plant wilt and droop down on a slight touch. What mechanism brings about this change?
Show by a series of diagrams, the change which a plant cell will undergo when placed in
Hypotonic salt solution
Define the cohesive force.
Give at least three uses of water to green plants
Give Reasons for the following.
We gargle with saline water in case of throat infection.
Differentiate between the following
Endosmosis and Exosmosis
Give Technical Term for the following.
A solution whose concentration is greater than that of the cell sap.
Name the following:
Name the process by which water enters the root hair cell.
Fill in the Blank
When there is no movement of water in the cell from the outside medium, the medium is considered to be ______ to cell sap.
Multiple Choice Question:
When a plant wilts, the sequence of events will be as follows:
Explain the term:
Plasmolysis
DPD of a cell can be expressed as ______
When a cell in solution shrinks and loses its shape, then the solution is ______.
Define the following term:
Osmotic Pressure
