MCQ on Class 8 Science Microorganisms Friends and Foe

Last updated on December 14th, 2023 at 08:02 am

MCQ on Class 8 Science Microorganisms Friends and Foe

 

Test your knowledge on microorganisms as friends and foes with engaging MCQs from the chapter’Microorganisms: Friends and Foe

 

Which of the following statements is true about micro-organisms?

  1. a) They can be seen with the naked eye.
  2. b) They are harmful to all living organisms.
  3. c) They can only be observed with a microscope.
  4. d) They do not have any impact on the environment.

Answer: c) They can only be observed with a microscope.

 

Which group of micro-organisms includes amoeba and paramecium?

  1. a) Bacteria
  2. b) Viruses
  3. c) Protozoa
  4. d) Fungi

Answer: c) Protozoa

 

Which of the following micro-organisms is multicellular?

  1. a) Algae
  2. b) Protozoa
  3. c) Bacteria
  4. d) Virus

Answer: a) Algae

 

Bacteria are classified as:

  1. a) Multicellular micro-organisms
  2. b) Unicellular micro-organisms
  3. c) Viruses
  4. d) Fungi

Answer: b) Unicellular micro-organisms

 

Which bacteria are responsible for nitrogen fixation?

  1. a) Lactobacillus bacteria
  2. b) Rhizobium bacteria
  3. c) Spherical bacteria
  4. d) Rod-shaped bacteria

Answer: b) Rhizobium bacteria

 

Which of the following diseases is NOT caused by bacteria?

  1. a) Cholera
  2. b) Typhoid
  3. c) Tuberculosis (TB)
  4. d) Malaria

Answer: d) Malaria

 

What is the full form of AIDS?

  1. a) Acquired Immune Deficiency System
  2. b) Acquired Infectious Disease Syndrome
  3. c) Acute Immunodeficiency Syndrome
  4. d) Acquired Immune Deficiency Syndrome

Answer: d) Acquired Immune Deficiency Syndrome

 

Which disease is caused by Ent amoeba?

  1. a) Malaria
  2. b) Dysentery
  3. c) Tuberculosis (TB)
  4. d) Cholera

Answer: b) Dysentery

 

What is the common name for Plasmodium?

  1. a) Malarial Parasite
  2. b) Amoebic Parasite
  3. c) Protozoan Parasite
  4. d) Ent amoeba Parasite

Answer: a) Malarial Parasite

 

Algae are plant-like organisms that produce food through:

  1. a) Respiration
  2. b) Reproduction
  3. c) Photosynthesis
  4. d) Digestion

Answer: c) Photosynthesis

 

Which type of algae has the ability to fix nitrogen gas from the atmosphere?

  1. a) Chlamydomonas
  2. b) Spirogyra
  3. c) Blue-green algae
  4. d) Diatoms

Answer: c) Blue-green algae

 

Fungi obtain their nutrition by:

  1. a) Photosynthesis
  2. b) Respiration
  3. c) Feeding on dead matter
  4. d) Parasitism

Answer: c) Feeding on dead matter

 

What are some human diseases caused by fungi?

  1. a) Influenza and common cold
  2. b) Tuberculosis and pneumonia
  3. c) Ringworm and athlete’s foot
  4. d) Malaria and dengue fever

Answer: c) Ringworm and athlete’s foot

 

Which micro-organism is responsible for the formation of curd from milk?

  1. a) Virus
  2. b) Fungi
  3. c) Bacteria
  4. d) Protozoa

Answer: c) Bacteria

 

The bacterium involved in the formation of curd from milk is called:

  1. a) Lactobacillus
  2. b) Rhizobium
  3. c) Aspergillus
  4. d) Penicillium

Answer: a) Lactobacillus

 

What do Lactobacillus bacteria convert in milk during the curd formation process?

  1. a) Fat
  2. b) Protein
  3. c) Lactose
  4. d) Calcium

Answer: c) Lactose

 

The conversion of lactose into lactic acid by Lactobacillus bacteria leads to the formation of:

  1. a) Milk
  2. b) Cheese
  3. c) Yogurt
  4. d) Butter

Answer: c) Yogurt

 

What is an antibiotic?

  1. a) A disease-causing micro-organism
  2. b) A medicine that kills disease-causing micro-organisms
  3. c) A type of fungus
  4. d) A type of bacteria

Answer: b) A medicine that kills disease-causing micro-organisms

 

Which of the following is an antibiotic made from fungi?

  1. a) Penicillin
  2. b) Streptomycin
  3. c) Erythromycin
  4. d) Tetracycline

Answer: a) Penicillin

 

Where are Rhizobium bacteria found in association with plants?

  1. a) Leaf surfaces
  2. b) Stem tissues
  3. c) Flower petals
  4. d) Root nodules

Answer: d) Root nodules

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