alleryCyanobacteria such as Anabaena serve as biofertilisers in:
ADesert sands
BFrozen soils
CMarine deeps
DPaddy fields
Answer & Solution
Correct answer: D. Paddy fields
1. These organisms need standing water to thrive.
2. One farming system floods its fields.
3. So they act as biofertilisers in paddy fields.
4. The answer is paddy fields.
_Source: syllabus Biology, Ch 8 'Microbes in Human Welfare'_
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