Question

What is the role of nitrogen-fixing bacteria in the ecosystem?

• A. They convert nitrogen into a usable form for plants
• B. They decompose plant material
• C. They produce oxygen
• D. They cause soil erosion

Hint:

Nitrogen-fixing bacteria are essential for enriching the soil with nitrogen, a key nutrient for plants. This process is vital for sustaining healthy ecosystems and agriculture.

Answer 1

The Correct Option is A

Step 1: Understanding the Question.
The question addresses the critical role nitrogen-fixing bacteria play in the ecosystem, particularly in the nitrogen cycle.

Step 2: Analyzing the Options.
(A) They convert nitrogen into a usable form for plants: Correct — Nitrogen-fixing bacteria convert atmospheric nitrogen into compounds that plants can absorb and use, which is essential for plant growth.
(B) They decompose plant material: This is not their primary function. Decomposers are fungi and certain bacteria, but not nitrogen fixers.
(C) They produce oxygen: Nitrogen-fixing bacteria do not produce oxygen. Oxygen is produced by plants through photosynthesis.
(D) They cause soil erosion: Nitrogen-fixing bacteria do not cause soil erosion. They actually contribute to soil health by enriching it with nitrogen.

Step 3: Conclusion.
The correct answer is (A) They convert nitrogen into a usable form for plants, as this is the primary role of nitrogen-fixing bacteria in the ecosystem.