Microbes as Biofertilisers — Prelims Strategy

Prelims Strategy

To ace NEET questions on 'Microbes as Biofertilisers', a structured approach is essential. Firstly, memorize key examples of biofertilisers along with their scientific names (e.g., *Rhizobium*, *Azotobacter*, *Azospirillum*, *Frankia*, *Anabaena*, *Nostoc*, *Bacillus*, *Pseudomonas*, VAM fungi).

Secondly, understand their specific functions – whether they are nitrogen fixers (symbiotic or free-living), phosphorus solubilisers, or plant growth promoters. For nitrogen fixers, differentiate between those for legumes and non-legumes, and those effective in specific conditions like waterlogged fields.

Thirdly, grasp the underlying mechanisms – how nitrogenase works, how organic acids solubilize phosphorus, or how mycorrhizae extend nutrient absorption. Fourthly, focus on symbiotic relationships, particularly the *Rhizobium*-legume interaction and mycorrhizal associations, understanding what each partner contributes.

Finally, be prepared for comparative questions (e.g., biofertilisers vs. chemical fertilisers) and questions on the environmental benefits. Practice identifying trap options that swap functions or microbial names.

For numerical problems (though rare here), ensure conceptual clarity. For conceptual questions, break down the options and eliminate distractors based on specific microbial roles.