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2017Q3(a)(iv)Absorption by Roots – The Processes Involved
Short answerModerate1 mark
3(a)

The diagram given below represents a plant cell after being placed in a strong sugar solution. Study the diagram and answer the questions that follow: The diagram given below represents a plant cell after being placed in a strong sugar solution. Study the diagram and answer the questions that follow:

Figure for this question

How can the above cell be brought back to its original condition? Mention the scientific term for the recovery of the cell.

Topic: Deplasmolysis

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Answer

Exam answer

By placing the cell in a HYPOTONIC solution — pure water — so that water re-enters by endosmosis and the protoplasm expands against the wall again.

The scientific term for this recovery is DEPLASMOLYSIS.

Explanation

Both halves must be answered: the METHOD and the TERM.

THE RULE: water moves from the more DILUTE solution to the more CONCENTRATED one. HYPERTONIC outside — water LEAVES — PLASMOLYSIS HYPOTONIC outside — water ENTERS — DEPLASMOLYSIS

The prefix DE- means reversal, so deplasmolysis is literally the undoing of plasmolysis.

AN IMPORTANT QUALIFICATION: recovery is possible only if the cell has not been plasmolysed for too long. A cell left in a strong solution eventually DIES, and then no amount of water will restore it.

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