Biology · Man and His Environment

Even though nitrogen is the main component of the atmosphere,plants can not use it directly from the atmosphere.Despite abundance of nitrogen in the atmosphere, deficiency of nitrogen is one of the most common reasons for stunted plant growth.

Nitrates absorbed by plants by assimilation is converted into ammonia in plants which is then incorporated to make nitrogen - containing organic molecules such as DNA and amino acids

Animal protein is synthesized in animals, not plants. Nitrates in plants are not directly converted into animal protein.

Nitrates absorbed by plant roots are initially converted into ammonia through a process called nitrate reduction, which is then used to form amino acids and other nitrogen-containing compounds.

While ammonia is used to synthesize amino acids, nitrates are not directly converted into amino acids. Ammonia is the immediate product of nitrate conversion.

Carbohydrates are not related to nitrogen assimilation. They are products of photosynthesis and not formed from nitrates.

This option is incorrect because ammonia is indeed the initial product of nitrate conversion in plants.