WBBSE Solutions For Class 8 School Science Chapter 7 The Microbial World Review Questions

Chapter 7 The Microbial World Review Questions MCQs

 

Question 1. Microbes are

  1. Living
  2. Non-living
  3. Inorganic compounds
  4. None of these

Answer: 1. Living

Question 2. Microbes are visible by

  1. Naked eye
  2. Microscope
  3. Hand lens
  4. Spectacle

Answer: 2. Microscope

Question 3. Bacteria, viruses, and protozoa are

  1. Animals
  2. Plants
  3. Microbes
  4. Carriers

Answer: 3. Microbes

Question 4. The application of microbial metabolism to transform simple raw materials into valuable products is called

  1. Biocatalysis
  2. Tissue culture
  3. Genetic engineering
  4. Fermentation

Answer: 4. Fermentation

Question 5. An ideal place of survival of microbes

  1. Damp places
  2. Sunny places
  3. Dry places
  4. Rocky surfaces

Answer: 1. Damp places

Read And Learn More WBBSE Solutions For Class 8 School Science Review Questions

Question 6. The microbes that can produce their own food

  1. Protozoa
  2. Virus
  3. Algae
  4. Bacteria

Answer: 3. Algae

Question 7. Microbes prefer the temperature for growth

  1. 0°C-5°c
  2. 25°C-35°c
  3. 100°C-110°c
  4. Sub-zero temperature

Answer: 2. 25°C-35°c

Question 8. For microscope observation, specimens are generally

  1. Moist
  2. Heated
  3. Stained
  4. Acidified

Answer: 3. Stained

Question 9. Which one is not a microbe?

  1. Bacteria
  2. Fungus
  3. Small plants
  4. Virus

Answer: 3. Small plants

Question 10. Microbes may be

  1. Beneficial or harmful
  2. Always Harmful
  3. Always Beneficial
  4. All of these

Answer: 1. Beneficial or harmful

Question 11. Curd, milk, cheese, and butter are produced with the help of

  1. Yeast
  2. Acetobacter
  3. Penicillium
  4. Streptococcus

Answer: 4. Streptococcus

Question 12. Antibiotics are mostly produced commercially from

  1. Viruses
  2. Saprophytic bacteria
  3. Parasitic host
  4. All of these

Answer: 2. Saprophytic bacteria

Question 13. Louis Pasteur is famous for the discovery of

  1. Bacteria
  2. Life
  3. Vaccine of hydrophobia
  4. Antigen

Answer: 3. Vaccine for hydrophobia

Question 14. Bacteria are placed under the kingdom

  1. Plantae
  2. Monera
  3. Protista
  4. Akaryota

Answer: 2. Monera

Question 15. Pseudopodia is the locomotory structure of

  1. Bacteria
  2. Algae
  3. Protozoa
  4. Virus

Answer: 3. Protozoa

Question 16. Hyphae is a term associated with

  1. Fungi
  2. Algae
  3. Microbes
  4. Virus

Answer: 1. Fungi

Question 17. Penicillium is a

  1. Fungus
  2. Algae
  3. Medicine
  4. Fertilizer

Answer: 1. Fungus

Question 18. An example of colonial algae is

  1. Chlamydomonas
  2. Volvox
  3. Spirogyra
  4. Mucor

Answer: 2. Volvox

Question 19. Biofertilizers include

  1. Cyanobacteria
  2. Mycorrhizal fungi
  3. Nitrifying bacteria
  4. All of these

Answer: 4. All of these

Question 20. Virus can be seen under

  1. Electron microscope
  2. Simple light microscope
  3. Compound light microscope
  4. None of these

Answer: 1. Electron microscope

Question 21. The nucleic acid of the virus is

  1. Both DNA and RNA
  2. Either DNA or RNA
  3. Only rna
  4. Only DNA

Answer: 2. Either DNA or RNA

Question 22. Viruses are

  1. Unicellular
  2. Multicellular
  3. Acellular
  4. Prokaryotes

Answer: 3. Acellular

Question 23. The word ‘virus’ in Latin means

  1. Poison
  2. Sweet
  3. Dangerous
  4. Friend

Answer: 1. Poison

Question 24. Which is not a bacterial disease?

  1. Tuberculosis
  2. Tetanus
  3. Cholera
  4. Aids

Answer: 4. Aids

Question 25. Which is a protozoan disease?

  1. Polio
  2. Malaria
  3. Ringworm
  4. Polio

Answer: 2. Malaria

Question 26. Diarrhea is transmissible through

  1. Air
  2. Carrier
  3. Water
  4. Food

Answer: 3. Water

Question 27. Amoebiasis is caused by a

  1. Protozoa
  2. Virus
  3. Fungus
  4. Algae

Answer: 1. Protozoa

Question 28. Rhizobium is a

  1. Parasite
  2. Symbiont
  3. Free-living
  4. Host

Answer: 2. Symbiont

Question 29. In humans, e. Coli supplies

  1. Vitamin b12
  2. Vitamin c
  3. Nitrogen
  4. Protein

Answer: 1. Vitamin b12

Question 30. Which of the following is not a communicable disease?

  1. Cancer
  2. Cholera
  3. Chickenpox
  4. Malaria

Answer: 1. Cancer

Question 31. Saprophytes draw nourishment from

  1. Living organism
  2. Parasites
  3. Dead organic matter
  4. Metallic substances

Answer: 3. Dead organic matter

Question 32. Which is not a nitrogen-fixing bacteria?

  1. Clostridium
  2. E. Coli
  3. Azotobqcter
  4. Y. Pestis

Answer: 2. E. Coli

Question 33. The breakdown of the nitrogenous compounds to ammonia is

  1. Ammonification
  2. Nitrification
  3. Nitrogen fixation
  4. Denitrification

Answer: 1. Ammonification

Question 34. Curd forming microorganisms is

  1. Lactobacillus
  2. Penicillium
  3. Rhizobium
  4. Metha no-bacteria

Answer: 1. Lactobacillus

Question 35. Which of the following diseases is not caused by bacteria?

  1. Cholera
  2. Typhoid
  3. Measles
  4. Tuberculosis

Answer: 3. Measles

Question 36. Antibiotics may be produced from

  1. Microbes
  2. Animals
  3. Plants
  4. Minerals

Answer: 1. Microbes

Question 37. The microorganisms which can multiply and reproduce only inside the cells of other organisms are

  1. Protozoa
  2. Fungi
  3. Virus
  4. Bacteria

Answer: 3. Virus

Question 38. Antibiotics are not effective against

  1. Bacteria
  2. Fungus
  3. Microbes
  4. Virus

Answer: 4. Virus

Question 39. Which of the following is not an area where microorganisms are employed?

  1. Preparation of drugs
  2. Recycling of materials in nature
  3. Preparation of food by photosynthesis
  4. Increasing the fertility of the soil

Answer: 3. Preparation of food by photosynthesis

Question 40. Proper vaccination can prevent the spread

  1. Bacteria
  2. Virus
  3. Protozoa
  4. Algae

Answer: 2. Virus

Question 42. Refrigeration helps in food

  1. Preservation
  2. Degradation
  3. Nitrification
  4. Preparation

Answer: 1. Preservation

Question 43. A pathogenic protozoan residing in the human digestive tract is

  1. T. Gambiense
  2. P. Ovale
  3. Trichonympha
  4. Giardia intestinalis

Answer: 4. Giardia intestinalis

Question 44. Which among the following vitamin is/are produced using microbes?

  1. Vit b12
  2. Carotene
  3. Riboflavin
  4. All of these

Answer: 4. All of these

Question 45. Which one is a viral disease ?

  1. Mumps
  2. Tetanus
  3. Pneumonia
  4. Ringworm

Answer: 1. Mumps

Chapter 7 The Microbial World Fill in the blanks

 

Question 1. The algae___________is used as food in the space station.
Answer: Chlorella

Question 2. Bread mold is a type of ___________
Answer: Fungus

Question 3. Microbes have survived over ___________ billion years on earth.
Answer: 3.5

Question 4. ___________ microbes can survive in presence of oxygen.
Answer: Aerobic

Question 5. ___________ are the microbes that can produce their own food.
Answer: Algae

Question 6. The process of coloring specimens for microscopic observation is known as ___________.
Answer: Staining

Question 7. An example of the kingdom Protista is ___________.
Answer: Protozoa

Question 8. Bacterial nucleus is known as___________ .
Answer: Nucleoid

Question 9. Membrane-bound cell organelle is absent in ___________.
Answer: Bacteria

Question 10. In 1674,___________ proved the existence of bacteria.
Answer: Leeuwenhock

Question 11. Bacteria are placed under the kingdom ___________
Answer: Monera

Question 12. Pseudopodia is the locomotory organ of some ___________.
Answer: protozoa

Question 13. Yeast is a unicellular ___________.
Answer: Fungus

Question 14. In fungus, a large number of ___________ together form mycelium.
Answer: Hyphae

Question 15. Fungi can not synthesize their food due to lack of ___________.
Answer: Chloroplast

Question 16. Spirogyra is a ___________ filamentous algae.
Answer: Multicellular

Question 17. Algae are ___________ in color.
Answer: Green

Question 18. Hydrophobia is a ___________ disease.
Answer: Viral

Question 19. Mushroom is a ___________.
Answer: Fungus

Question 20. Parasites live in association with ___________.
Answer: Host

Question 21. Vitamin deficiency may be caused by the death of beneficial ___________ within our intestine.
Answer: Bacteria

Question 22. Rhizobium lives in the root nodules of ___________ plants.
Answer: Leguminous

Question 23. Lichen has an association of ___________ and fungus.
Answer: algae

Question 24. In the case of symbiosis both organisms of an association are mutual ___________.
Answer: Benefited

Question 25. The process of surviving on decomposed organic wastes is known as ___________.
Answer: Saprophytes

Question 26. Clostridium is a ___________ fixing bacteria.
Answer: Nitrogen

Question 27. Alcohol is produced from sugar by the fungus ___________
Answer: Yeast

Question 28. Pasteurization is performed to preserve ___________.
Answer: Milk

Question 29. The antibiotic is produced from the fungus ___________ Penicillium.
Answer: Penicillin

Question 30. The natural form of resistance against infection is called ___________.
Answer: Immunity

Chapter 7 The Microbial World Identify As ‘True’ Or ‘False’

Question 1. is not seen by the naked eye.
Answer: True

Question 2. Microbes have most above.
Answer: False

Question 3. The aerobic microbe can survive in absence of oxygen.
Answer: False

Question 4. Bacteria belong to the kingdom Protista.
Answer: False

Question 5. Some microbes can produce their own food.
Answer: True

Question 6. Staining is required for the microscopic observation of specimens.
Answer: False

Question 7. Bacteria, fungi, and plants are microbes.
Answer: False

Question 8. All microbes are harmful.
Answer: False

Question 9. Plastid is absent in bacteria.
Answer: False

Question 10. Rotest Koch discovered the pathogens of malaria.
Answer: False

Question 11. A few protozoa are multicellular.
Answer: False

Question 12. All protozoa possess cilia or flagella
Answer: False

Question 13. Fungi can grow either in the presence or absence of sunlight.
Answer: True

Question 14. Spirogyra is unicellular algae.
Answer: False

Question 15. viruses are acellular.
Answer: True

Question 16. Sibiu. lost’s body viruses behave as inert particles.
Answer: True

Question 17. Influenza and mumps are viral diseases.
Answer: True

Question 18. Ringworm is an animal.
Answer: False

Question 19. AIDS may be transmitted by coughing and sneezing.
Answer: False

Question 20. Rhizobium is a symbiotic protozoan.
Answer: False

Question 21. Lichen is a parasite.
Answer: False

Question 22. Plants can not take atmospheric nitrogen directly from the air.
Answer: False

Question 23. Soyabean is a leguminous plant.
Answer: True

Question 24. Bacteria can convert vinegar to alcohol.
Answer: False

Question 25. The vaccine is an antibiotic drug.
Answer: False

Question 26. Microbes may be used in the treatment of waste materials.
Answer: True

Chapter 7 The Microbial World Match The Column

1. 

Column – A Column – B
A. Bacteria 1. Fungi
B. Protozoa 2. Plantae
C. Fungus 3. Monera
D. Algae 4. Protista

Answer: A-3,B-4,C-1,D-2

2.

 Column – A Column – B
A. Bacteria 1. living or non-living
B. Virus 2. mycelium or hyphae
C. Fungi 3. pseudopodia or cilia
D. Protozoa 4. cell wall and nucleoid

Answer: A-4,B-1,C-2,D-3

3. 

Column – A Column – B
A. Malaria 1. Through food
B. Tuberculosis 2. Through vector
C. Amoebiasis 3. Through blood
D. Hepatitis 4. Through cough

Answer: A-2,B-4,C-1,D-3

4.

Column – A Column – B
A. Plasmodium 1. Saprophyte
B. Lichen 2. Parasite
C. Clostridium 3. Free-living
D. Mucor 4. Symbiotic

Answer: A-2,B-4,C-1,D-3

5.

Column – A Column – B
A. Barber’s itch 1. Bacteria
B. Diarrhoea 2. Virus
C. Encephalitis 3. Fungi
D. Leprosy 4. Protozoans

Answer: A-3,B-4,C-2,D-1

6.

Column =- A Column- B
A. Through drinking water 1. AIDS
B.Through vector 2. Amoebiosis
C. Through blood 3. Kalazar
D. Through air 4. Tuberculosis

Answer: A-2,B-3,C-1,D-4

Leave a Comment