Question

Which of the following contribute to nitrogen availability in the soil

• A. Nitrogen wastes from excretion and death
• B. Lightning in the atmosphere
• C. Nitrogen fixing bacteria and blue green algae
• D. All of the above

Answer 1

Answer: (D)

All of the above

• Nitrogen present in plants and animals decay by denitrificans and gets absorbed into the soil.
• During lightning and thunders nitrogen gets fixed into the soil.
• Atmospheric nitrogen is fixed through fixation by bacteria and blue green algae in the soil.

Thus, option D, all of the above is correct.