Ontario Grade 9 Science Class Practice Exam

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How do plants utilize nitrates?

  1. By converting them into nitrogen gas

  2. By absorbing them into their roots

  3. By breaking them down into ammonium

  4. By emitting them into the atmosphere

The correct answer is: By absorbing them into their roots

Plants utilize nitrates by absorbing them into their roots. Option A is incorrect because plants do not convert nitrates into nitrogen gas, rather they absorb nitrates and use them to build proteins and DNA. Option C is also incorrect because plants do not break down nitrates into ammonium, rather they use nitrates as an important source of nitrogen for their growth. Option D is incorrect because plants do not emit nitrates into the atmosphere, rather they use them to support their growth and metabolism.

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