| Priyanka took a destarched potted plant and set up an experiment as shown in the figure. She left the plant in sunlight for few hours and then tested the leaves X and Y for starch. Leaf X did not give starch test while leaf Y showed presence of starch. |
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| What is proved by this experiment? |
A) Chlorophyll is necessary for photo-synthesis.
B) Carbon dioxide is necessary for photo- synthesis.
C) Light is necessary for photosynthesis.
D) Oxygen is given out during photo-synthesis.
Correct Answer: B
Solution :
In the given experiment, leaf X did not give starch test because it was inside the flask filled with potassium hydroxide (KOH). KOH absorbed \[C{{O}_{2}}\] released during respiration by leaf. So, the leaf inside the flask did not get \[C{{O}_{2}}\], and hence could not participate in photosynthesis and could not form starch. Thus, we can conclude\[C{{O}_{2}}\], is essential for photosynthesis.
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