Assertion: Tropical plants have a higher optimum temperature for photsynthesis than temperate plants
Reason: The temperature optimum for photosynthesis of different plants depends on their habitat.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Assertion**: The assertion states that tropical plants have a higher optimum temperature for photosynthesis compared to temperate plants. This is based on the fact that tropical regions are generally warmer than temperate regions.

2. **Understanding the Reason**: The reason provided explains that the temperature optimum for photosynthesis in different plants is influenced by their habitat. This means that plants have adapted to their specific environments, which affects their photosynthetic efficiency at different temperatures.

3. **Tropical vs. Temperate Plants**: Tropical plants, such as many C4 plants, are adapted to thrive in warmer conditions. They possess specialized anatomical features (like Kranz anatomy) that allow them to efficiently carry out photosynthesis even at higher temperatures. In contrast, temperate plants, which are adapted to cooler climates, have a lower optimum temperature for photosynthesis.

4. **Conclusion**: Both the assertion and the reason are true. The assertion is correct because tropical plants do have a higher optimum temperature for photosynthesis than temperate plants. The reason is also true as it correctly explains that the temperature optimum for photosynthesis is dependent on the habitat of the plants.

5. **Final Statement**: Therefore, both the assertion and the reason are true, and the reason correctly explains the assertion.

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