Question

5. Which of the following statements regarding nitrogen is/are incorrect?

I. About 3/4 of the atmosphere is made up of nitrogen.

II. Living organisms use nitrogen for respiration

III. Nitrogen is a part of the photosynthesis process

• A. Only statement I is incorrect.
• B. Only statement III is incorrect.
• C. Both statements I and III are incorrect.
• D. Both statements II and III are incorrect.

Answer 1

The correct option is D

Both statements II and III are incorrect.

Explanation:

(D) Although nitrogen is abundant in the environment in a 78% mass ratio, it is not useful in respiration or photosynthetic processes.

• Photosynthetic processes: Plants utilise light and carbon dioxide (CO₂) to generate the sugars they need to thrive, releasing oxygen in the process. Photosynthesis is the lungs of our planet.
• Role of nitrogen in the atmosphere: Nitrogen (N) is one of the most important elements in life since it is required for the survival of all plants and animals. Nitrogen (N₂) makes up over 3/4 of our atmosphere, but it is in an inactive state that we cannot reach. Nitrogen in a "fixed," reactive state is required by humans and most other life on the planet.

Conclusion: Thus, option (D) is the correct answer.