Ontario Grade 9 Science Class Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

Master Grade 9 Science with our comprehensive practice exam. Test your knowledge, identify weak areas, and boost your confidence for academic success.

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

In the nitrogen cycle, what process involves the incorporation of nitrogen into organic compounds?

Nitrogen fixation
Nitrification
Assimilation
Denitrification

The correct answer is: Assimilation

Assimilation is the process where nitrogen is incorporated into organic compounds. Nitrogen fixation (option A) involves converting nitrogen gas into a form usable by plants. Nitrification (option B) is the process of converting ammonia into nitrate. Denitrification (option D) is the process of converting nitrates back into nitrogen gas. These processes all play a role in the nitrogen cycle, but they do not involve the incorporation of nitrogen into organic compounds. Therefore, option C is the best answer.