Which is a man-made ecosystem?
AA salt marsh
BA crop field
CA rainforest
DA wide river
Answer & Solution
Correct answer: B. A crop field
1. Most ecosystems form without human help.
2. A few are built and maintained by people.
3. Crop fields and aquaria are man-made ecosystems.
4. So the answer is a crop field.
_Source: NCERT Class 12 Biology, Ch 12 'Ecosystem'_
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