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Grade 9 Exam  >  Grade 9 Test  >  Test: Biogeochemical Cycles - Grade 9 MCQ

Biogeochemical Cycles - Free MCQ Practice Test with solutions, Grade 9


MCQ Practice Test & Solutions: Test: Biogeochemical Cycles (5 Questions)

You can prepare effectively for Grade 9 with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Biogeochemical Cycles". These 5 questions have been designed by the experts with the latest curriculum of Grade 9 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 10 minutes
  • - Number of Questions: 5

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Test: Biogeochemical Cycles - Question 1
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Carbon is incorporated into life-forms through:

Detailed Solution: Question 1

By the process of photosynthesis, carbon dioxide is fixed and converted into carbohydrates.

Test: Biogeochemical Cycles - Question 2
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The transfer of matter and energy between different components of biosphere is called:

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Test: Biogeochemical Cycles - Question 3
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The organisms responsible for returning nutrients to the ecosystem include:

Detailed Solution: Question 3

Every part of an ecosystem is vital to its survival – from the green plants to furry animals and microscopic bacteria. The group of organisms called decomposers forms the final link in the food chain. They break down dead animals and plants and return vital nutrients to the soil.

Test: Biogeochemical Cycles - Question 4
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Through which process is oxygen returned to the atmosphere?

Detailed Solution: Question 4

photosynthesis is correct answer. 

Test: Biogeochemical Cycles - Question 5
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Nitrogen-fixation by bacteria does not occur in the presence of:

Detailed Solution: Question 5

Certain bacteria such as Azotobacter (occur freely in the soil) and Rhizobium (occur in root nodules of leguminous plants as pea, gram, bean, etc), convert the atmospheric nitrogen into water soluble nitrates. The process of biofixation of nitrogen is called as nitrogen fixation.
Enzymes required for biofixation of nitrogen are nitrogenases. There nitrogenases are very suseptible to destruction by oxygen. Many bacteria cease the production of enzymes in the presence of oxygen. Many nitrogen fixing bacteria grow in anaerobic conditions or respire to bring down oxygen levels or binding oxygen with the proteins like leg haemoglobin.

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About this Grade 9 Practice Test

This test contains 5 MCQs on Biogeochemical Cycles with detailed solutions for each question. It is part of the course on EduRev, designed to align with the current Grade 9 syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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