ISA Certified Arborist Practice Exam

What does chlorophyll do in relation to photosynthesis?

1. Makes the leaves shrink

2. Makes the leaves red

3. Makes the leaves green

4. Makes the leaves hard

The correct answer is: Makes the leaves green

Chlorophyll is a green pigment found in plants and algae that is essential for the process of photosynthesis. This process converts light energy into chemical energy that the plant can use as food. Chlorophyll absorbs energy from sunlight, allowing plants to use it to produce glucose and oxygen from carbon dioxide and water. A is incorrect because chlorophyll does not cause the leaves to shrink. B is incorrect because chlorophyll is responsible for the green color of leaves, not red. D is incorrect because chlorophyll has no effect on the texture of leaves. Additionally, photosynthesis is the primary reason why leaves are green, so it makes sense that chlorophyll, the green pigment, is essential for this process.