Ontario Grade 9 Science Class Practice Exam

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What process involves plants absorbing nitrates?

Photosynthesis
Respiration
Assimilation
Transpiration

The correct answer is: Assimilation

Assimilation is the process by which plants absorb nitrates from the soil and use them to build proteins and other complex molecules. Photosynthesis (A) involves the conversion of light energy into chemical energy for plants to use. Respiration (B) is the process of breaking down glucose to release energy for cellular functions. Transpiration (D) is the loss of water vapor through plant leaves. None of these processes directly involve the absorption of nitrates by plants, making them incorrect options.