Question

multiple choice
why is the nitrogen cycle important for plants?
a the nitrogen cycle helps protect plants from diseases that would otherwise kill them.
b the nitrogen cycle provides nitrate, an important nutrient for plant growth.
c the nitrogen cycle is necessary for a plant to undergo photosynthesis.
d the nitrogen cycle helps protect plants from pests that would otherwise harm them.

Explanation:

Plants need nitrogen - containing compounds like nitrates for growth. The nitrogen cycle converts nitrogen gas in the atmosphere into forms like nitrates that plants can absorb and use for processes such as protein synthesis. It is not directly related to protecting from diseases or pests, and photosynthesis mainly requires carbon - dioxide, water, and light energy, not nitrogen cycle directly for the photosynthetic process itself.

Answer:

B. The nitrogen cycle provides nitrate, an important nutrient for plant growth.