7

Set 3: Central Ideas

Explanation

Answer: B

PASSAGE

The following text explains a biological process in plants. Photosynthesis is the process by which green plants create their own food. Using sunlight, water, and carbon dioxide, plants produce glucose (sugar), which provides them with energy to grow. A byproduct of this process is oxygen, which is released into the atmosphere. This makes photosynthesis vital not just for plants, but for all life on Earth that requires oxygen.

Why is photosynthesis described as vital for life on Earth?

A. It helps plants grow taller than animals
B. It releases oxygen into the atmosphere✓ Correct
C. It consumes all the carbon dioxide in the air
D. It protects plants from being eaten

Detailed Explanation

Choice B is correct. The text states that a byproduct is oxygen, making the process 'vital... for all life on Earth that requires oxygen.'

Key Evidence:

• "oxygen... released into the atmosphere"

• "vital... for all life on Earth that requires oxygen"

Why others are wrong: A (Not mentioned), C (Too extreme (consumes some, not all)), D (Not mentioned).

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