Question

Which experiment proves that oxygen is evolved by plants during photosynthesis?

• A. Hydrilla experiment
• B. Mohl's half leaf experiment
• C. Black paper experiment
• D. None of the above

Answer 1

The Correct Option is A

To solve this question, we need to identify which experiment proves that oxygen is evolved by plants during photosynthesis.

1. Hydrilla Experiment:
The Hydrilla experiment, conducted by Joseph Priestley and others, involves placing a plant (Hydrilla) in water and observing the production of oxygen when exposed to light. In this experiment, oxygen bubbles were observed to evolve from the plant, proving that oxygen is a byproduct of photosynthesis in plants.

2. Evaluating the Options:

• (A) Hydrilla experiment – Correct; it provides evidence for oxygen evolution during photosynthesis. ✔
• (B) Mohl's half leaf experiment – Incorrect; Mohl's experiment demonstrated the process of transpiration, not oxygen evolution.
• (C) Black paper experiment – Incorrect; this experiment is used to demonstrate the effect of light on photosynthesis, but does not directly prove oxygen evolution.
• (D) None of the above – Incorrect; the Hydrilla experiment clearly proves oxygen evolution during photosynthesis.

Final Answer:
The correct answer is (A) Hydrilla experiment.