Plant nitrogen assimilation: Identify what plants convert absorbed soil nitrates into. Full question: Plants absorb dissolved nitrates (NO₃⁻) from the soil and convert them into which biomolecules? Choose the correct option.

Difficulty: Easy

Proteins
Starch
Lipids
Cellulose
Chlorophyll only

Correct Answer: Proteins

Explanation:

Given data & pathway

Plants take up nitrate (NO₃⁻) from soil.

Concept/Approach
Nitrate is reduced to nitrite (NO₂⁻) and then to ammonium (NH₄⁺), which is incorporated into amino acids. Amino acids are then polymerized to form proteins.

Key steps
NO₃⁻ → NO₂⁻ → NH₄⁺ → amino acids → proteins

Final Answer
Proteins.

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