Primary Productivity Variation Across Ecosystems — NEET
📚 Practice ConceptPrimary productivity depends on the plant species inhabiting a particular area. It also depends on a variety of environmental factors, availability of nutrients and photosynthetic capacity of plants. Therefore, it varies in different types of ecosystems. The annual net primary productivity of the whole biosphere is approximately 170 billion tons (dry weight) of organic matter. Of this, despite occupying about 70 per cent of the surface, the productivity of the oceans are only 55 billion tons. Rest of course, is on land. Discuss the main reason for the low productivity of ocean with your teacher.
Assertion (A): Primary productivity varies significantly among different ecosystems. Reason (R): Primary productivity depends on plant species, environmental factors, nutrient availability, and photosynthetic capacity of plants.
View solution & NCERT explanation
Correct answer: A — If both assertion and reason are true and the reason is the correct explanation of the assertion.
NCERT confirms productivity varies among ecosystems and states “Primary productivity depends on the plant species inhabiting a particular area. It also depends on a variety of environmental factors, availability of nutrients and photosynthetic capacity of plants.” Both statements are true from NCERT. The Reason correctly explains WHY productivity varies - multiple interacting factors create different productivity levels in different ecosystems.
What does NCERT say about Primary productivity depends on?
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