Where do plants get the nitrogen they need to create amino acids and DNA?

Question

A)Plants get their nitrogen from nitrogen gas (N2), which moves into leaves through holes called stomata.

B)Plants take up nitrates (NO3-) from the soil and convert them into ammonia (NH3).

C)Nitrogen-fixing bacteria convert nitrogen gas (N2) into ammonia (NH3), and plants take up some of the ammonia (NH3) through their roots.

D)Both B and C are correct.

A, B, and C are all correct.

Answer 1

The correct answer is D) Both B and C are correct.

Here's a breakdown of the options:

• A) This is incorrect because while nitrogen gas (N2) is abundant in the atmosphere, plants cannot directly use it; they do not take it up through stomata.

• B) This is correct. Plants primarily take up nitrates (NO3-) from the soil, which can then be converted into ammonia (NH3) within the plant through various biochemical processes.

• C) This is also correct. Nitrogen-fixing bacteria in the soil or in symbiotic relationships with certain plants convert nitrogen gas (N2) into ammonia (NH3), which plants can then absorb through their roots.

Therefore, both B and C provide accurate ways that plants can obtain the nitrogen necessary for amino acids and DNA synthesis.