OpenSAT

Question #N11

The process of photosynthesis begins when light energy is captured by chlorophyll, a green pigment found in plants. Chlorophyll absorbs light, which is then used to convert carbon dioxide and water into glucose and oxygen. This process is essential for life on Earth, as it provides the food and oxygen that all living things need. What role does chlorophyll play in the process of photosynthesis?

Which choice provides the most logical and grammatically correct way to complete the sentence?

A. Chlorophyll, a green pigment found in plants, absorbs light, which is then used to convert carbon dioxide and water into glucose and oxygen.

B. Chlorophyll absorbing light, which is then used to convert carbon dioxide and water into glucose and oxygen.

C. Chlorophyll, a green pigment found in plants, absorbing light, which is then used to convert carbon dioxide and water into glucose and oxygen.

D. Chlorophyll—a green pigment found in plants—absorbs light, which is then used to convert carbon dioxide and water into glucose and oxygen.

Reveal Answer Go Back

Correct Answer is: A

Choice A is the most logical and grammatically correct way to complete the sentence. It correctly uses a comma to set off the nonessential phrase "a green pigment found in plants." Choices B and C are incorrect because they create comma splices. Choice D is incorrect because it uses dashes to set off the nonessential phrase, which is not grammatically correct in this context.