Ontario Grade 9 Science Class 2025 – 400 Free Practice Questions to Pass the Exam

Plants absorb nitrates from the soil through their roots as part of the process of assimilation. This process involves the incorporation of inorganic nitrogen, specifically from nitrates, into organic molecules like amino acids and proteins that are essential for plant growth and development. Assimilation allows plants to utilize the nitrogen available in their environment, which is crucial for building the building blocks of life.

The other processes listed do not directly involve the absorption of nitrates. Photosynthesis is the process by which plants convert carbon dioxide and water into glucose and oxygen using sunlight, while respiration is the process through which plants and animals convert glucose and oxygen into energy, releasing carbon dioxide and water. Transpiration refers to the loss of water vapor from plant leaves, which is important for nutrient transportation but does not involve the uptake of nitrates.