A plant leaf is covered with black paper. What happens to photosynthesis in that part?

The part of the leaf covered with black paper will not perform photosynthesis because light cannot reach that area.

Key Points

Factor	Effect	Explanation
Light Blocked	No photosynthesis	Light is essential for the process
Chlorophyll Present	Still inactive	Even if chlorophyll is there, it cannot work without light
Glucose Production	Stops in covered area	No food is produced in that part
Uncovered Area	Continues normally	Only exposed parts perform photosynthesis

Stepwise Understanding

1. Black paper blocks sunlight completely

2. Covered part does not receive light

3. Photosynthesis stops in that region

4. No starch is formed in covered area

5. Uncovered parts continue making food

Important Concept

Light is a necessary condition for photosynthesis, without it the process cannot occur even if other factors are present.

Real Insight

In experiments, when iodine test is done, covered part of leaf does not turn blue black, showing no starch formation. students sometimes get confused here but its simple.

So the covered portion basically becomes inactive for photosynthesis while rest of the leaf keeps working.