Question:

Which of the following sentences does not contribute to the main idea of the paragraph? 1. Climate change is threatening biodiversity. 2. Animals may struggle to survive as their habitats are disrupted. 3. Climate change is beneficial for species adaptation. 4. Rising temperatures are affecting ecosystems and habitats. 5. Species extinction is a risk due to climate change.

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When checking for the main idea, look for the "Direction" of the argument. If four sentences point toward "Danger/Negative," any sentence pointing toward "Benefit/Positive" is the incorrect one, even if it uses the same keywords like "Climate Change."
Updated On: Apr 1, 2026
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The Correct Option is C

Solution and Explanation

Concept: The main idea of a passage is the central theme that most of the sentences support. In "odd-one-out" sentence questions, we look for logical consistency. If most sentences describe a negative impact, a sentence describing a positive impact (or vice versa) will be the one that does not contribute to the cohesive main idea.
Step 1:
Analyze the tone and subject of each sentence.

• Sentence 1: Focuses on the threat to biodiversity (Negative).
• Sentence 2: Focuses on the struggle of animals and habitat disruption (Negative).
• Sentence 4: Focuses on rising temperatures adversely affecting ecosystems (Negative).
• Sentence 5: Focuses on the risk of extinction (Negative).

Step 2:
Identify the contradictory statement.
Sentence 3 states that climate change is "beneficial" for species adaptation. This presents a positive outlook that directly contradicts the established main idea of the other four sentences, which highlight the destructive and threatening nature of climate change.
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