| Consider the following statements about bio-fertilisers. |
| 1. Bio-fertilisers are organisms that enrich the nutrient quality of the soil. |
| 2. Bio-fertilisers do not contain any chemicals which are harmful to the living soil. |
| 3. The main sources of bio-fertilisers are bacteria, fungi and cyanobacteria. |
| 4. Bio-fertilisers add nutrients through the natural processes of nitrogen fixation, solubilising phosphorus and stimulating plant growth through the synthesis of growth promoting substances. |
| Which of the statement(s) given above is/are correct? |
A) Only 2
B) 3 and 4
C) 2, 3 and 4
D) (d) All of these
Correct Answer: D
Solution :
[d] All the given statements are correct. A bio-fertiliser is a substance which contains living microorganisms which, when applied to seed, plant surfaces or soil, colonises the rhizosphere or the interior of the plant and promotes growth by increasing the supply or availability of primary nutrients to the host plant. Bio-fertilisers add nutrients through the natural processes of nitrogen fixation, solubilising phosphorus and stimulating plant growth through the synthesis of growth promoting substances.
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