Question:
Identify the vegetation type which has the highest Net Primary Productivity among the following different vegetation types.
Identify the vegetation type which has the highest Net Primary Productivity among the following different vegetation types.
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NPP = (Heat + Moisture + Sunlight). Tropical rain forests have the maximum of all three, making them the most productive ecosystem globally.
Updated On: Aug 20, 2026
- Temperate Forests
- Tropical Rain Forests
- Tropical Grassland
- Tropical Thorn Forests
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Question:
Net Primary Productivity (NPP) is the amount of biomass (organic matter) accumulated by plants per unit area per unit time, after subtracting the energy used for respiration.
Step 2: Detailed Explanation:
• Factors for Productivity: NPP is primarily determined by solar radiation, temperature, and moisture availability. High heat and high humidity maximize the rate of photosynthesis.
• Comparison: Tropical Rain Forests are located near the equator where it is warm and wet year-round. There is no dormant winter season or severe dry period to slow down growth.
• Statistical Value: Tropical Rain Forests have an NPP of about 2,000 $g/m^2/year$ or more. Temperate forests have roughly 1,200 $g/m^2/year$, while arid systems like thorn forests are much lower ($<$ 700 $g/m^2/year$).
• Biomass accumulation: Due to the dense, multi-layered canopy and continuous growing season, rain forests are the most productive terrestrial ecosystems on Earth.
• Conclusion: Tropical Grasslands (Savannas) and Thorn Forests are limited by seasonal droughts, and Temperate forests are limited by winter cold, leaving Rain Forests as the leaders in productivity.
Step 3: Final Answer:
The highest Net Primary Productivity is found in Tropical Rain Forests.
Net Primary Productivity (NPP) is the amount of biomass (organic matter) accumulated by plants per unit area per unit time, after subtracting the energy used for respiration.
Step 2: Detailed Explanation:
• Factors for Productivity: NPP is primarily determined by solar radiation, temperature, and moisture availability. High heat and high humidity maximize the rate of photosynthesis.
• Comparison: Tropical Rain Forests are located near the equator where it is warm and wet year-round. There is no dormant winter season or severe dry period to slow down growth.
• Statistical Value: Tropical Rain Forests have an NPP of about 2,000 $g/m^2/year$ or more. Temperate forests have roughly 1,200 $g/m^2/year$, while arid systems like thorn forests are much lower ($<$ 700 $g/m^2/year$).
• Biomass accumulation: Due to the dense, multi-layered canopy and continuous growing season, rain forests are the most productive terrestrial ecosystems on Earth.
• Conclusion: Tropical Grasslands (Savannas) and Thorn Forests are limited by seasonal droughts, and Temperate forests are limited by winter cold, leaving Rain Forests as the leaders in productivity.
Step 3: Final Answer:
The highest Net Primary Productivity is found in Tropical Rain Forests.
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