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Question

Choose the correct statement about the gaseous exchange in living organisms.

A
Plants take in oxygen and give off carbon dioxide during photosynthesis.
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B
Animals take in carbon dioxide and give off oxygen during respiration.
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C
Animals take in oxygen and give off carbon dioxide during respiration.
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D
Aquatic organisms cannot undergo gas exchange with their environment.
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E
Gas exchange only occurs in organisms with lungs.
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Solution

The correct option is C Animals take in oxygen and give off carbon dioxide during respiration.
  • Animals take up oxygen released during photosynthesis from plants and give off carbon dioxide through respiration.
  • Plants, on the other hand, utilizes the carbon dioxide released from animals to perform photosynthesis. And oxygen is one of the by-products of this process.
  • Aquatic organisms undergo gas exchange with their environment, i.e., water.
  • Gas exchange can occur in the lungs, skin, gills, etc.
Therfore option C is correct.

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