The following text is from a biology article.
Photosynthesis is the process by which plants convert sunlight into chemical energy. Chlorophyll in plant leaves absorbs light, primarily in the blue and red wavelengths. This energy drives chemical reactions that transform carbon dioxide and water into glucose and oxygen. The glucose provides fuel for plant growth, while oxygen is released as a byproduct.
Which choice best describes the function of the last sentence?
It introduces a new process unrelated to photosynthesis.
It explains the products and their uses in the process described.
It contradicts the earlier explanation of energy conversion.
It questions the scientific accuracy of the passage.
Correct Answer: B
Choice B is the best answer. The last sentence explains what happens to the products (glucose fuels growth, oxygen is released), completing the process description.
- Evidence: The sentence states: "The glucose provides fuel... while oxygen is released as a byproduct."
- Reasoning: This explains the function/fate of the substances created in the previous step.
- Conclusion: The function is to explain the products and their uses.
💡 Strategy: Identify the subject of the sentence (glucose and oxygen) and what is said about them (fuel, released).
Choice A is incorrect because it continues the photosynthesis topic. Choice C is incorrect because it supports, not contradicts. Choice D is incorrect because accuracy isn't questioned.