CBSE · Class 8 · Science · Microorganisms: Friend and FoeBlue-green algae fix which gas to enhance soil fertility?
Step-by-Step Solution
Blue-green algae (cyanobacteria) fix atmospheric nitrogen directly from the air to enhance soil fertility and enrich it with nutrients.
Detailed Options Breakdown
Option : Oxygen
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Microorganisms: Friend and Foe.
Option 1: Carbon dioxide
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Microorganisms: Friend and Foe.
Option 2: Nitrogen (Correct Answer)
Correct choice. Refer to the step-by-step verified solution guidelines above for details.
Option 3: Hydrogen
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Microorganisms: Friend and Foe.
💡 Study Guide: This question tests core syllabus concepts from Microorganisms: Friend and Foe. For formulas, key summaries, and mock exam reference guides, read the full Microorganisms: Friend and Foe Revision Notes.