Class 8th Biology // Chapter - Microorganisms // Objective Questions & Answers

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Question 1.Diseases like polio and chicken pox are caused by _______

A) Bacteria
B) Fungi
C) Virus
D) Worms

Answer= (C) Virus

 Question 2. Examples of Multicellular Microorganism are

A) Algae, Bacteria
B) Bacteria and Fungi
C) Bacteria and Viruses
D) Algae and Fungi

Answer= (D) Algae and Fungi  

 Question 3. Some medicines obtained from micro-organisms are applied to kill or stop the growth of disease-causing microorganisms. Such medicines are called ______.

A) Antibodies
B) Antibiotics
C) Antiseptics
D) All of the above

Answer= (B) Antibiotics

 Question 4. A common preservative used in jam and pickles is

A) Sodium benzoate
B) Nitric acid
C) Sodium Chloride
D) Copper Sulphate

Answer= (A) Sodium benzoate  

 Question 5. Rhizobium found in root nodules of leguminous roots is an

A) Atmospheric Carbon fixer
B) Atmospheric Oxygen fixer
C) Atmospheric Nitrogen fixer
D) All of the above

Answer= (C) Atmospheric Nitrogen fixer

 Question 6. Lactobacillus is commonly found in

A) Cake
B) Curd
C) Bread
D) All of the above

Answer= (B) Curd 

 Question 7. The process of conversion of sugar into alcohol by yeast is called

A) Fermentation
B) Pasteurisation
C) Alcoholism
D) All of the above

Answer= (A) Fermentation  

 Question 8. The pores in the bread is due to gas bubbles of

A) Oxygen
B) Nitrogen di oxide
C) Nitrogen
D) Carbon di oxide

Answer= (D) Carbon di oxide  

 Question 9. Deliberately injecting weak microbes into a healthy body and producing antibodies to fight against strong microbes is called _______

A) Medication
B) Antibiotics
C) Vaccination
D) All of the above

Answer= (C) Vaccination  

 Question 10. The microbe for Malaria is carried by

A) Male Anopheles mosquito
B) Female Anopheles Mosquito
C) Male Aedes mosquito
D) Female Aedes mosquito

Answer= (B) Female Anopheles Mosquito 

 Question 11. Alcohol is produced with the help of

A) sodium chloride
B) yeast
C) nitrogen mosquito
D) carbon dioxide

Answer= (B) yeast  

 Question 12. Which of the following drug is an antipyretic?

A) Insulin
B) Alcohol
C) Streptomycin
D) Paracetamol

Answer= (D) Paracetamol  

 Question 13. What helps in the rise of bread or dosa dough?

A) Heat
B) Grinding
C) Growth of yeast cells
D) Low pressure

Answer= (C) Growth of yeast cells  

 Question 14. The status of algae in the aquatic food chain is

A) consumers
B) producers
C) host
D) small in size

Answer= (B) producers 

 Question 15. The rod shaped bacteria are called

A) Bacillus
B) Coccus
C) Vibrio
D) Spirillum

Answer= (A) Bacillus 

 Question 16. Bacteria present in root nodules of pea

A) Coli
B) Plasmodium
C) Rhizobium
D) Penicillin

Answer= (C) Rhizobium  

 Question 17. The microorganism which contains chlorophyll

A) Virus
B) Fungus
C) Algae
D) All

Answer= (C) Algae 

 Question 18. The disease caused by protozoa is

A) tuberculosis
B) polio
C) typhoid
D) malaria

Answer= (D) malaria  

 Question 19. Which cannot fix atmospheric nitrogen in the soil?

A) Rhizobium
B) Clostridium
C) Azotobacter
D) Penicillin

Answer= (D) Penicillin  

 Question 20. The disease caused by fungi is

A) measles
B) chicken pox
C) polio
D) ringworm

Answer= (D) ringworm

 Question 21. Which bacteria helps in settling of curd?

A) Rhizobium
B) Lactobacillus
C) Vibriocholarae
D) Bacillus

Answer= (B) Lactobacillus 

 Question 22. Which microorganism causes AIDS?

A) protozoa
B) A bacteria
C) A virus
D) An algae

Answer= (C) A virus  

 Question 23.Which of the following disease is spread due to bacteria?

A) Tuberculosis
B) Measles
C) Chicken pox
D) Polio

Answer= (A) Tuberculosis

 Question 24. Which of the following is not used as food preservatives?

A) Salt
B) Sugar
C) Vinegar
D) Methane

Answer= (D) Methane 

 Question 25. The process by which amount of nitrogen remains the same in the atmosphere is known as

A) fermentation
B) carbon cycle
C) nitrogen cycle
D) photosynthesis

Answer= (C) nitrogen cycle