Question

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

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

Answer 1

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.