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Question
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
The plasma membrane permits the passage of all solutes and water.
Options
True
False
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Solution
False
Correct Statement: It permits the passage of certain substances.
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RELATED QUESTIONS
Give reason for the following:
Potato cubes, when placed in water, become firm and increase in size.
The following diagram represents a plant cell after being placed in a strong sugar solution.
Guidelines 1 to 5 indicate the following
(1)Cell wall, (2) Strong sugar solution, (3) Protoplasm (4) Large vacuole, (5) Nucleus
(1)What is the state of the cell shown in the cell shown in the diagram?
(2)Name the structure which acts as a selectively permeable membrane.
(3)If the cell had been placed in distilled water instead of strong sugar solution, which feature would not have been seen?
(4)Name any one feature of this plant cell which is not present in an animal cell.
Distinguish between the following:
Filtration and diffusion
Name the following:
Two solutions having same concentrations.
Explain why:
Bacteria and fungi do not grow in pickles, jams, jellies and squashes.
Two potato cubes each 1 cm3 in size, were placed separately in two containers (A and B), the container A having water and the other (B) containing concentrated sugar solution. After 24 hours when the cubes were examined, those placed in water were found to be firm and had increased slightly in size and those placed in concentrated sugar solution were found to be soft and somewhat decreased in size. Use the above information to answer the questions that follow:
Name and define the physical process being investigated in this experiment.
The diagram given below is of an experiment just at the start. Study the diagram carefully and answer the following questions :
(i) What does the experiment demonstrate?
(ii) Define, the process demonstrated in the experiment.
(iii) What changes are observed after a few hours?
(iv) Give two examples of a semi-permeable membrane.
(v) Which limb of the U-tube contains a more concentrated sucrose solution, A or B?
(vi) Why is the membrane separating the two solutions labeled as semi-permeable membrane?
Name the following:
The process by which raisins swell up when placed in a beaker of water.
Fill in the Blank
A plasmolysed cell has __________ protoplast.
