Plasmolysis in a plant cell is defined as

Breakdown (lysis) of plasma membrane in hypotonic medium

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Shrinkge of protoplasm in hypertonic medium

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Shrinkage of nucleoplasm

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None of the above

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Solution

The correct option is D Shrinkge of protoplasm in hypertonic medium
When a cell is kept in hypertonic solution then exosmosis occurs, i.e., water molecules move outward from lower solute concentration to higher solute concentration through cell membrane. Due to this, the cell protoplasm shrinks. Exosomosis is also termed as plasmolysis.

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Question 7
Plasmolysis in a plant cell is defined as

(a) break down (lysis) of the plasma membrane in hypotonic medium
(b) shrinkage of cytoplasm in a hypertonic medium
(c) shrinkage of nucleoplasm
(d) none of the above

Q. Plasmolysis will occur when the cell is placed in a
(a) hypotonic solution
(b) isotonic solution
(c) hypertonic solution
(d) acidic solution

Q. Read the given statements and select the correct option.
Statement 1: Plasmolysis is bursting of cell membrane when a cell is kept in a hypertonic solution.
Statement 2: Hypertonic solution causes endosmosis.

Q. Which option shows correct pairs of Column - I and Column - II.

Column - I	Column - II
(i) Plasmolysis	(a) Phenomenon when a cell is placed in an isotonic solution
(ii) Cells turgidity	(b) Cytoplasm loses contact with the cell wall
(iii) Flaccid cell	(c) Phenomenon when a cell is placed in a hypotonic solution
(iv) Incipient plasmolysis	(d) Phenomenon when a turgid plant cell is placed in an hypertonic solution

Q. Assertion :A plant cell shrinks in hypertonic solution. Reason: In hypertonic solution, water moves out of the cells due to plasmolysis.

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