Question
Some microbes act as very good biofertilisers. Explain with the help of three suitable examples.
✓
Answer
- Mycorrhizae:
- The fungus absorbs phosphorus from the soil and passes it to the plant.
- Plants with mycorrhiza show resistance to root-borne pathogens.
- They show increased tolerance to salinity and drought.
- There is an overall increase in plant growth and development.
- Anabaena:
- It is a cyanobacterium that fixes atmospheric nitrogen in the soil; it also adds organic matter to the soil through its photosynthetic activity.
- Rhizobium:
- It forms nodules in the roots of legumes and fixes atmospheric nitrogen in the form of ammonia which the plants use.
- Trichoderma:
- This fungus lives freely in the root ecosystem of many plants. It is used as biocontrol agent against many plant pathogens.
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