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Bacteria such as Rhizobium, Azotobacter and Anabaena are mainly used in agriculture as:
ACloning agents
BEdible vaccines
CHerbicides
DBiofertilizers
Answer & Solution
Correct answer: D. Biofertilizers
1. These microbes improve nitrogen fixation and phosphate solubilisation in soil.
2. Used in place of chemical fertilisers, they act as biofertilizers.
3. They are not vaccines, herbicides or cloning tools, so the other options do not apply.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 8 "Cell Biology and Biotechnology", p.102_
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