Advertisements
Advertisements
Question
Give reason for the following:
Potato cubes, when placed in water, become firm and increase in size.
Advertisements
Solution
Potato cubes contain an excess of salts and sugars as compared to the water in which they are placed. Hence, due to endosmosis, water from the surrounding area enters the potato cubes, making them firm and increasing their size.
APPEARS IN
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?
Give the equivalent terms for the following:
Pressure of the cell contents on the cell wall
The bending movements of certain flowers towards the sun and the sleep movements of certain plants at night are examples of ______.
Explain how soaked seeds swell up and burst their seed coats.
Explain why:
The leaves of wilted lettuce, if kept in cold water, become crisp.
Mention whether the following statement is true (T) or false (F) and give explanation in support of your answer.
Plasmolysis is reverse of deplasmolysis.
Give Technical Term for the following.
A solution whose concentration is equal to the cell sap.
Multiple Choice Question:
When a plant wilts, the sequence of events will be as follows:
During a practical exam, a plant cell in a particular solution was placed under a compound microscope. Students were told to observe the cell and name the tonicity of the solution and mention the process that occurred in the cell.
Define the following term:
Tonicity
