Ontario Grade 9 Science Class Practice Exam 2025 - Free Grade 9 Science Practice Questions and Study Guide

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How do plants utilize nitrates?

By converting them into nitrogen gas

By absorbing them into their roots

Plants utilize nitrates primarily by absorbing them into their roots from the soil. Nitrates are a crucial source of nitrogen, an essential nutrient that plants require for growth and development. Once absorbed, plants convert these nitrates into amino acids and proteins, which are vital for various cellular processes and overall plant health.

While converting nitrates into nitrogen gas and emitting them into the atmosphere is part of the nitrogen cycle, it occurs through different processes, primarily involving bacteria in the soil, rather than being a direct function of plant activity. Similarly, breaking nitrates down into ammonium can also occur in the soil but is not the primary way plants utilize nitrates. Thus, the correct understanding of how plants use nitrates is by absorbing them through their roots, where they can then use them for growth.

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By breaking them down into ammonium

By emitting them into the atmosphere

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