Question

Choose the correct statement.

• A. Annual NPP of land area is higher than oceans.
• B. NPP is greater than GPP in terrestrial ecosystems.
• C. Secondary productivity is always higher than Primary productivity in Oceanic ecosystem.
• D. Primary productivity is unaffected by environmental factors.

Hint:

Land NPP is about 115 and ocean NPP is about 55 billion tons.

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
Four statements about productivity are given. Only one matches the passage and basic ecology.

Step 2: Check option 1:
Land gives about 115 billion tons and oceans about 55 billion tons. So land is higher. Correct.

Step 3: Check option 2:
NPP is GPP minus respiration loss, so NPP is always smaller than GPP. Wrong.

Step 4: Check option 3:
Consumers get only a small part of what plants make, so secondary productivity is lower than primary. The word always makes it wrong.

Step 5: Check option 4:
The passage says primary productivity depends on species, nutrients and other environmental factors. Wrong.

Final Answer:
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