Question

C.
Biofertilizers
Due to use of biofertilizers instead of chemical
fertilizers, nitrogen fixation and phosphate
solubilization abilities of the plants are improved.
Mainly the bacteria like Rhizobium. Azotobacter,
Nostoc, Anabaena and plants like Azolla are used
as biofertilizers.
Introduction
In the last year, we have studied the tissue
culture. Genetic improvement of the plants has
become possible due to tissue culture and besides,
those characters inherited to next generation.
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Answer 1

Answer:

A biofertilizer (also bio-fertilizer) is a substance which contains living micro-organisms which, when applied to seeds, plant surfaces, or soil, colonize the rhizosphere or the interior of the plant and promotes growth by increasing the supply or availability of primary nutrients to the host plant.[1] Biofertilizers add nutrients through the natural processes of nitrogen fixation, solubilizing phosphorus, and stimulating plant growth through the synthesis of growth-promoting substances. The microorganisms in biofertilizers restore the soil's natural nutrient cycle and build soil organic matter. Through the use of biofertilizers, healthy plants can be grown, while enhancing the sustainability and the health of the soil. Biofertilizers can be expected to reduce the use of synthetic fertilizers and pesticides, but they are not yet able to replace their use. Since they play several roles, a preferred scientific term for such beneficial bacteria is "plant-growth promoting rhizobacteria" (PGPR).