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The overall productivity in terrestrial ...

The overall productivity in terrestrial ecosystems is limited by

A

temperature

B

water

C

sunlight

D

a combination of the above

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Productivity in Ecosystems**: - Productivity refers to the rate at which energy is produced in an ecosystem, primarily through photosynthesis in plants. This energy is then transferred through the food chain. 2. **Identifying Factors Affecting Productivity**: - Productivity in terrestrial ecosystems is influenced by various factors, which can be broadly categorized into abiotic (non-living) and biotic (living) factors. 3. **Examining Abiotic Factors**: - Key abiotic factors include: - **Temperature**: Affects metabolic rates and growth of organisms. - **Water**: Essential for photosynthesis and nutrient transport. - **Sunlight**: The primary energy source for photosynthesis. 4. **Considering Biotic Factors**: - Biotic factors include: - **Plant Species**: Different plants have varying capacities for photosynthesis and growth. - **Herbivory**: The impact of herbivores on plant populations can limit productivity. - **Competition**: Plants compete for resources like light, water, and nutrients. 5. **Conclusion**: - The overall productivity in terrestrial ecosystems is limited by a combination of both abiotic and biotic factors. Therefore, the correct answer is that productivity is influenced by the interplay of temperature, water, sunlight, and various biotic factors. **Final Answer**: The overall productivity in terrestrial ecosystems is limited by a combination of abiotic factors (temperature, water, sunlight) and biotic factors (plant species, herbivory, competition). ---
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