Question

Plants do not need to obtain much oxygen from the atmosphere, because:

• A. Plants do not use oxygen for respiration.
• B. Plants carry out cellular respiration using carbon dioxide.
• C. Plants produce oxygen during photosynthesis and utilise the oxygen produced for respiration.
• D. Plants do not carry out respiration.

Answer 1

The correct option is C Plants produce oxygen during photosynthesis and utilise the oxygen produced for respiration.

Plants are active photosynthesisers i.e., they take up carbon dioxide from the atmosphere and using the energy from sunlight and water they convert it into carbohydrate molecules. During this process, plants produce oxygen. They utilise the oxygen produced for respiration. Since they need comparitively lesser oxygen than what they produce, they do not need to take up more oxygen from the atmosphere.