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Standard XII
Biology
Question

What would happen if a green algae is placed in salt-water?
  1. It will swell due to osmosis.
  2. Protoplasm shrinks due to plasmolysis.
  3. Chlorophyll will leak out.
  4. None of the above.

A
Chlorophyll will leak out.
B
Protoplasm shrinks due to plasmolysis.
C
None of the above.
D
It will swell due to osmosis.
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Solution
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The correct option is B Protoplasm shrinks due to plasmolysis.
If a green algae is placed in salt-water protoplasm shrinks due to plasmolysis because the solute concentration is high in the external environment as compared to the cell of algae.
Plasmolysis is the process in which cells lose water in a hypertonic solution. The salt water present outside the green algae causes the water content of algae to ooze out. As a result of this, the protoplasm shrinks.

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