Question

comprehension questions on nitrogen cycle

1. what percentage of the atmosphere is nitrogen?

a. 50%
b. 78%
c. 90%
d. 65%

1. what is the primary role of nitrogen in plant growth?

a. it helps with photosynthesis
b. its essential for protein formation
c. it increases soil acidity
d. it promotes flowering

1. which form of nitrogen is preferred by annual plants?

a. ammonium
b. nitrate
c. urea
d. nitrite

Explanation:

1. Nitrogen makes up about 78% of Earth's atmosphere.
2. Nitrogen is a key - component in amino - acids which are building blocks of proteins in plants.
3. Annual plants generally prefer nitrate as a nitrogen source for its high solubility and ease of uptake.

Answer:

1. B. 78%
2. B. It's essential for protein formation
3. B. Nitrate