Biology

The correct answer is B.assimilation.

Assimilation is the process by which plants absorb usable forms of nitrogen—specifically nitrates (NO₃⁻)—from the soil through their roots. Once absorbed, these nitrates are incorporated into plant tissues and used to make vital compounds like amino acids, proteins, and nucleic acids.

Here’s a brief explanation of the other options:

A.Nitrification: This is the process by which soil bacteria convert ammonia (NH₃) or ammonium (NH₄⁺) into nitrates (NO₃⁻), making nitrates available for plants to absorb. However, nitrification itself is not the process by which plants absorb nitrogen.

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