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Test: Biogeochemical Cycles - Class 9 MCQ


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5 Questions MCQ Test - Test: Biogeochemical Cycles

Test: Biogeochemical Cycles for Class 9 2024 is part of Class 9 preparation. The Test: Biogeochemical Cycles questions and answers have been prepared according to the Class 9 exam syllabus.The Test: Biogeochemical Cycles MCQs are made for Class 9 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Biogeochemical Cycles below.
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Test: Biogeochemical Cycles - Question 1
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Carbon is incorporated into life-forms through:

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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:

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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?
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photosynthesis is correct answer. 

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