Why do plants need nitrogen?

• A. To absorb water from the soil
• B. To produce glucose during photosynthesis
• C. To facilitate pollination
• D. To synthesize amino acids and proteins essential for growth

Answer: (D)

Verified step by step guidance

1. Understand the role of nitrogen in plants: Nitrogen is a vital macronutrient that plants require for growth and development. It is a key component of amino acids, which are the building blocks of proteins.
2. Recognize the importance of proteins: Proteins are essential for various cellular functions, including enzyme activity, structural support, and metabolic processes in plants.
3. Learn how plants acquire nitrogen: Plants absorb nitrogen from the soil primarily in the form of nitrate (NO₃⁻) or ammonium (NH₄⁺) ions. These ions are taken up by the roots and transported to different parts of the plant.
4. Understand nitrogen's role in amino acid synthesis: Nitrogen is incorporated into amino acids through biochemical pathways, such as the nitrogen assimilation process, which involves enzymes like glutamine synthetase.
5. Connect nitrogen to overall plant growth: Amino acids and proteins synthesized using nitrogen contribute to the formation of chlorophyll, DNA, RNA, and other essential molecules, enabling plants to grow, reproduce, and carry out photosynthesis effectively.