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Test: Microorganisms Friend & Foe- 3


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20 Questions MCQ Test General Science(Prelims) by IRS Divey Sethi | Test: Microorganisms Friend & Foe- 3

Test: Microorganisms Friend & Foe- 3 for Class 8 2022 is part of General Science(Prelims) by IRS Divey Sethi 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 2022 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 the smallest microorganism?

Detailed Solution for Test: Microorganisms Friend & Foe- 3 - Question 1

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 2

Identify W, X and Y?

Detailed Solution for Test: Microorganisms Friend & Foe- 3 - Question 2

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

Test: Microorganisms Friend & Foe- 3 - Question 3

Identify bacteriophage.

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

A bacteriophage  also known informally as a phage is a virus that infects and replicates within bacteria and archaea. Bacteriophages are composed of proteins that encapsulate a DNA or RNA genome, and may have structures that are either simple or elaborate.

Test: Microorganisms Friend & Foe- 3 - Question 4

Which of the following statements describes bacteriophage correctly?

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

Bacteriophage is a type of virus which attacks bacteria.

Test: Microorganisms Friend & Foe- 3 - Question 5

Fungi reproduces by

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

Fungi reproduces by spore formation.

Test: Microorganisms Friend & Foe- 3 - Question 6

Which one of the following is called pond silk?

Detailed Solution for Test: Microorganisms Friend & Foe- 3 - Question 6

Spirogyra is called pond silk.

Test: Microorganisms Friend & Foe- 3 - Question 7

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 7

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.

Test: Microorganisms Friend & Foe- 3 - Question 8

Which of the following microorganisms play an important role in maintaining the balance of nitrogen gas in the atmosphere?

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

➡️ Rhibozium is the bacteria which play an important role in mainting the balance of nitrogen gas in atmosphere.
➡️ This bacteria shows Symbosis relationship.
➡️ The bacteria like Azatobacter , Nosac etc... shows nitrogen fixation in atmosphere.
➡️ They provide Nitrogen to plants. which is an essential element of plants.

Test: Microorganisms Friend & Foe- 3 - Question 9

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

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

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

Test: Microorganisms Friend & Foe- 3 - Question 10

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 10

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

Test: Microorganisms Friend & Foe- 3 - Question 11

Which of the following enzymes is secreted by bacteria that can digest cellulose?

Detailed Solution for Test: Microorganisms Friend & Foe- 3 - Question 11

Cellulase is secreted by bacteria that can digest cellulose.

Test: Microorganisms Friend & Foe- 3 - Question 12

Which of the following is/are the functions performed by the microorganisms in the field of biotechnology?

Detailed Solution for Test: Microorganisms Friend & Foe- 3 - Question 12

The production of hormones and gene therapy through micro- organism is taken up in the field of biotechnology.

Test: Microorganisms Friend & Foe- 3 - Question 13

Which of the following is/are produced by using bacteria?

Detailed Solution for Test: Microorganisms Friend & Foe- 3 - Question 13

Antibiotics cheese and yoghurt are produced by bacteria.

Test: Microorganisms Friend & Foe- 3 - Question 14

Which of the following terms is given to the microorganisms that cause diseases?

Detailed Solution for Test: Microorganisms Friend & Foe- 3 - Question 14

Most microbes belong to four major groups: bacteria, viruses, protozoa or fungi. A few harmful microbes, for example less than 1% of bacteria, can invade our body (the host) and make us ill. Microbes cause infectious diseases such as flu and measles.

There is also strong evidence that microbes may contribute to many non–infectious chronic diseases such as some forms of cancer and coronary heart disease. Different diseases are caused by different types of microorganisms. Microbes that cause disease are called pathogens.Disease-causing microbes can also be called pathogens, germs or bugs and are responsible for causing infectious diseases.

Test: Microorganisms Friend & Foe- 3 - Question 15

Which of the following disease causing pathogens is / are carried by mosquitoes?

Detailed Solution for Test: Microorganisms Friend & Foe- 3 - Question 15

Pathogens causing Dengue fever and malaria are carried by mosquitoes.

Test: Microorganisms Friend & Foe- 3 - Question 16

Identify the disease that is caused by protozoa.

Detailed Solution for Test: Microorganisms Friend & Foe- 3 - Question 16

The disease is malaria.

Test: Microorganisms Friend & Foe- 3 - Question 17

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 17

Options (i) and (ii) are true about the microorganisms the diseases they cause and the symptoms.

i) Malaria is a life-threatening disease. It's typically transmitted through the bite of an infected Anopheles mosquito. Infected mosquitoes carry the Plasmodium parasite.

Symptoms of malaria can develop as quickly as 7 days after you're bitten by an infected mosquito.

  • high temperature of 38C or above.
  • feeling hot and shivery.
  • headaches.
  • vomiting.
  • muscle pains.
  • diarrhoea.
  • generally feeling unwell.

ii) Hepatitis B is a potentially life-threatening liver infection caused by the hepatitis B virus (HBV). It is a major global health problem. It can cause chronic infection and puts people at high risk of death from cirrhosis and liver cancer

Common symptoms of hepatitis B infection

  • Feverfatigue, muscle or joint pain.
  • Loss of appetite.
  • Mild nausea and vomiting.
  • Stomach pain.
  • Pale or light colored stools.
  • Dark, tea colored urine.
Test: Microorganisms Friend & Foe- 3 - Question 18

Which of the following can affectively prevent the ringworm disease?

Detailed Solution for Test: Microorganisms Friend & Foe- 3 - Question 18

Improving personal hygiene prevents ringworm disease because ringworm is a fungal infection so doesn't treated by vaccine or anti bacterial medicine.

Test: Microorganisms Friend & Foe- 3 - Question 19

Which of the following bacteria lives symbiotically in pea plants?

Detailed Solution for Test: Microorganisms Friend & Foe- 3 - Question 19

Rhizobium bacteria live symbiotically.

Test: Microorganisms Friend & Foe- 3 - Question 20

Which of the following bacteria causes Cholera?

Detailed Solution for Test: Microorganisms Friend & Foe- 3 - Question 20

Vibrio causes cholera.

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