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Test: Microorganisms Friend & Foe- 3 - Class 8 MCQ


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10 Questions MCQ Test - Test: Microorganisms Friend & Foe- 3

Test: Microorganisms Friend & Foe- 3 for Class 8 2024 is part of Class 8 preparation. The Test: Microorganisms Friend & Foe- 3 questions and answers have been prepared according to the Class 8 exam syllabus.The Test: Microorganisms Friend & Foe- 3 MCQs are made for Class 8 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Microorganisms Friend & Foe- 3 below.
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Test: Microorganisms Friend & Foe- 3 - Question 1

Which of the following is an example of a communicable disease?

Detailed Solution for Test: Microorganisms Friend & Foe- 3 - Question 1
Tuberculosis is a communicable disease that spreads through the air from an infected person to a healthy person. It is different from non-communicable diseases like diabetes and cancer.
Test: Microorganisms Friend & Foe- 3 - Question 2

What type of microorganism causes anthrax?

Detailed Solution for Test: Microorganisms Friend & Foe- 3 - Question 2
Anthrax is caused by the bacterium Bacillus anthracis. It affects both humans and animals, especially cattle.
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Test: Microorganisms Friend & Foe- 3 - Question 3

What is the primary method for controlling the spread of dengue fever?

Detailed Solution for Test: Microorganisms Friend & Foe- 3 - Question 3
Dengue fever is spread by mosquitoes, so preventing mosquito bites using mosquito nets and repellents is crucial for controlling the disease.
Test: Microorganisms Friend & Foe- 3 - Question 4

Which of the following options is/are true about the diseases, microorganisms which cause them and the symptoms of the diseases?

Detailed Solution for Test: Microorganisms Friend & Foe- 3 - Question 4

Both options (A) and (B) are correct.

  • Option A: Malaria is caused by the protozoan Plasmodium and symptoms include fever and chills.
  • Option B: Hepatitis B is caused by a virus and can lead to symptoms such as a swollen liver.

Option C is incorrect because cholera is caused by a bacterium, not a virus. Symptoms of cholera include vomiting and diarrhea.

Test: Microorganisms Friend & Foe- 3 - Question 5

What process takes place when yeast is added to grape juice and left for a week?

Detailed Solution for Test: Microorganisms Friend & Foe- 3 - Question 5

Fermentation takes place when yeast is added to grape juice and left for a week.

Test: Microorganisms Friend & Foe- 3 - Question 6
What role does Lactobacillus play in food production?
Detailed Solution for Test: Microorganisms Friend & Foe- 3 - Question 6
Lactobacillus bacteria are used to convert milk into curd. They ferment lactose, leading to the formation of curd.
Test: Microorganisms Friend & Foe- 3 - Question 7

Which of the following is the smallest microorganism?

Detailed Solution for Test: Microorganisms Friend & Foe- 3 - Question 7

A virus is in the average smaller than a bacteria and unicellular algae are more or less in the same size domain as bacteria but more commonly algae are multicellular and hence larger.

Test: Microorganisms Friend & Foe- 3 - Question 8

What causes the dough to rise when yeast is added to it?

Detailed Solution for Test: Microorganisms Friend & Foe- 3 - Question 8

The release of carbon dioxide gas causes dough to rise when yeast is added to it. (Fermentation)

Test: Microorganisms Friend & Foe- 3 - Question 9

Identify W, X and Y?

Detailed Solution for Test: Microorganisms Friend & Foe- 3 - Question 9

In the given figure W - virus, X - fungus and Y - protozoan.

Test: Microorganisms Friend & Foe- 3 - Question 10

The moist bread becomes mouldy after a few days when it is left in a container with a cover. Which of the following conditions favour the growth of the fungus?

Detailed Solution for Test: Microorganisms Friend & Foe- 3 - Question 10

If a piece of bread is kept in a container in a moist place for two to three days, some light type of hairy growth may happen on the surface. It is generally referred to as the bread mold. It is a kind of fungus. The absence of light and moist temperature favour the growth of the fungus.

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