Chapter: Enhancement of Food Production· Biology

Which of the following biofertilizers is used by farmers to increase the yield of rice crop?

Q.1 (iii) Which of the following biofertilizers is used by farmers to increase the yield of rice crop?

A. Azotobacter

B. Azospirillum

C. Bacillus

D. Azolla

Doubtly Asked 29 Oct 2026 Board exam · July 2025 hsc 12th Save WhatsApp Report

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Answer: (d) Azolla

Azolla, a water fern, carries the nitrogen-fixing cyanobacterium Anabaena azollae in its leaves. It is grown in flooded paddy fields, where it fixes atmospheric nitrogen and adds organic matter, increasing the yield of rice.

Doubtly AI · 29 Oct 2026 AI-verified · Nov 2026 Report

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Which of the following biofertilizers is used by farmers to increase the yield of rice crop?

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