Biofertilizer include
nitrogen-fixing bacteria, nitrogen-fixing cyanobacteria and mycorrhizal fungi
Biofertilisers:
Biofertilizers are biological products that include living microorganisms that were applied to seed, plant surfaces, or soil, promoting growth by several microorganisms by increasing the supply of nutrients, increasing root area, and increasing the nutrient uptake capacity of the plant.
The correct option is D:
The explanation of the correct option:
Nitrogen-fixing bacteria, nitrogen-fixing cyanobacteria, and mycorrhizal fungi are all biofertilizers that are used to increase the nutrient quantity and the resistance of the soil and enhance the absorption power of soil.
The explanation of the incorrect option:
Option (a)-
Nitrogen-fixing bacteria are also used in biofertiliser.
Option (b)-
Nitrogen-fixing bacteria are also used in biofertiliser.
Option (c)-
Not all cyanobacteria and bacteria can not be used in biofertilisers.
Final Answer: Biofertilizers include nitrogen-fixing bacteria, nitrogen-fixing cyanobacteria and mycorrhizal fungi.