Assertion Reason Questions for Class 8 Science Chapter 2 Microorganisms – Friend and Foe
Here we are providing assertion reason questions for class 8 science. In this article, we are covering Class 8 Science Chapter 2 Microorganisms – Friend and Foe.
Directions:
The question below consists of an assertion and a Reason. Use the following key to choose the appropriate answer.
A. If both assertion and reason are correct and reason is correct explanation of the assertion
B. If both assertion and reason are correct, but the reason is not the correct explanation of the assertion.
C. If assertion is correct, but reason is incorrect.
D. If assertion is incorrect, but reason is correct.
Q.1. Assertion: Virus is considered as being on the borderline between living and nonliving entities.
Reason: They are able to multiply on their own.
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Answer: (A)Q.2. Assertion: Antibiotics should be taken on the advice of doctors for prescribed time and duration.
Reason: If taken when not required antibiotics may kill some of useful bacteria in the body.
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Answer: (A)Q.3. Assertion: The replenishment of soil with nutrients is done by some microorganisms.
Reason: Fungi and bacteria are common decomposer.
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Answer: (A)Q.4. Assertion: Disease which spreads from an infected person to healthy person is known as non –communicable disease.
Reason: The disease spreads from one person to another through air, water, food, physical contact or insect.
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Answer: (C)Q.5. Assertion: Malaria, Dengue can be prevented by using mosquito net and mosquito repellent.
Reason: The causative organism spread through contaminated food and water.
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Answer: (B)Q.6. Assertion: The fungi live on or inside other plant and animal.
Reason: they are able to grow anywhere on land, water
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Answer: (A)Q.7. Assertion: Microorganism releases harmful substances called toxins.
Reason: Toxins can cause diseases in plants.
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Answer: (A)Q.8. Assertion: Nitrogen fixation is useful in agriculture.
Reason: Nitrogen fixing bacteria are present in root nodules of legumes.
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Answer: (A)Q.9. Assertion: A mosquito can cause many diseases in humans.
Reason: Mosquito can be controlled by preventing stagnation in water.
