Which two gases make up the bulk of atmosphere?

Correct option is D

Correct Answer: (D) Nitrogen and Oxygen
Explanation:
→ The Earth’s atmosphere is composed mainly of Nitrogen (about 78%) and Oxygen (about 21%).
→ Together, these two gases form nearly 99% of the atmosphere.
→ Other gases like argon, carbon dioxide, and helium are present only in very small amounts.
→ Hence, nitrogen and oxygen make up the bulk of the atmosphere.
Information Booster:
→ Nitrogen helps in plant growth through nitrogen cycle.
→ Oxygen is essential for respiration.
→ Argon forms less than 1% of the atmosphere.
→ Carbon dioxide is important for photosynthesis but present in trace amounts.
Additional Information (Other Options):
Option (A): Helium is present only in trace amounts.
Option (B): Argon is not the second major gas.
Option (C): Carbon dioxide is less than 0.04%.