Biology
Grade-10
Easy
Question
Why is nitrogen the most limiting nutrient for plant growth?
- High energy is required to break triple bond
- Nitrogen is almost an inert gas as its reactions requires extreme conditions
- Nitrogen cannot be directly utilised by plants
- All of the above
Hint:
Nitrogen gas (N2) makes up nearly 80% of the Earth's atmosphere, yet nitrogen is often the nutrient that limits primary production in many ecosystems. Nitrogen fixation is necessary because plants and animals are not able to use nitrogen gas in that form.
The correct answer is: All of the above
- Nitrogen gas (N2) makes up nearly 80% of the Earth's atmosphere, yet nitrogen is often the nutrient that limits primary production in many ecosystems.
- A species of bacteria called Rhizobium helps in nitrogen fixation.
- These bacteria live in the roots of leguminous plants (e.g., pea and beans plants), and using certain types of enzymes, they help in fixing nitrogen in the soil.
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