Nitrogen-fixing bacteria in root nodules fix nitrogen in soil and air into:
Correct answer: A. Ammonia
- A. Ammonia
- B. Nitrite
- C. Nitrate
- D. Amino acid
Explanation
The symbiotic nitrogen-fixing bacteria invade the root hairs of host plants, where they convert free nitrogen to ammonia, which the host plant utilizes for its development.This is scientifically accurate hence we have marked option A as the correct option though according to Punjab textbooks, it is C i.e. 'Nitrates'.
This question appeared on the NUMS 2015 paper, which you can sit online with every answer explained.
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About Plant Nutrition and Transport
Plants require macronutrients and micronutrients for growth, and mineral deficiencies produce recognizable symptoms. Transport involves water and minerals through xylem by transpiration pull, cohesion and adhesion, while phloem translocates sugars from sources to sinks. Root pressure and transpiration are distinct mechanisms.
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