The biofertilizers are
Correct answer: A. Anabaena and Azolla
- A. Anabaena and Azolla
- B. Cow dung, manure, and farmyard waste
- C. Quick growing crop plowed under soil
- D. None of these
Explanation
Biofertilizers are organisms that bring about nutrient enrichment of the soil. Azotobacter is a free-living, aerobic, nitrogen-fixing bacteria. Anabena is a nitrogen-fixing cyanobacteria that occurs in both free-living and symbiotic associations with Azolla, Cycas roots, etc. Rhizobium lives symbiotically in root nodules of legumes and non legumes. Vesicular-arbuscular mycorrhiza (VAM) is an example of endomycorrhiza in which fungal hyphae penetrate the cortical cells of grasses to form vesicles.
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Ecosystems include biotic and abiotic components, food chains and webs, energy flow, nutrient cycles, populations and ecological relationships. Pollution and conservation cover air, water, soil and noise pollution, their effects on organisms, biodiversity loss, protected areas, sustainable resource use and methods for reducing environmental damage.
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