CBSE Questions for Class 8 Biology Microorganisms Friend And Foe Quiz 4 - MCQExams.com

Mark the correct statement.

(A) Common salt has been used to preserve meat and fish for ages.
(B) Meat and fish are covered with dry salt to check the growth of bacteria.
(C) Salting is also used to preserve amla, raw mangoes, tamarind, etc.
  • (A) and (B) only
  • (B) and (C) only
  • (A) and (C) only
  • All of the above
Suspensions of killed or weakened microbes or derivatives of microorganisms are called ________
  • Drugs
  • Probiotics
  • Vaccines
  • Antibiotics
Salt is used in raw mangoes, amla, tamarind for
  • Enhancing the taste
  • Enhancing the colour of pickle 
  • Preservation 
  • None of the above
Vaccines are important for
  • Children
  • Adults
  • Both A and B
  • None of the above
A boy was invited by his friend to a party and he ate a variety of foodstuff. On reaching home he started vomiting. He had to be taken to a hospital. The doctor said that this condition could be due to ________
  • Empty stomach
  • Food poisoning
  • Due to weak stomach movement
  • All of the above
Salt preservation technique is generally used in ________
  • Pickles
  • Jams and jellies
  • Fruit drinks
  • Both A and B
Diseases like polio and chicken pox are caused by ________.
  • Bacteria
  • Fungi
  • Viruses
  • Worms
Disease caused due to the consumption of contaminated food is ________________.
  • Food adulteration
  • Food poisoning
  • Rancidity
  • All of the above
The undesirable change in a food that makes it unsafe for human consumption is referred to as:
  • Food wastage
  • Food spoilage
  • Food loss
  • All of the above
Mark the incorrect statement
  • Food poisoning could be due to the consumption of food spoilt by some microorganisms.
  • Microorganims that grow on out food sometimes produce toxic substances.
  • Insect make the food poisonous causing serious illness and even death.
  • None of these
Food poisoning occurs because of bad food handling practices in:
  • Restaurants
  • Retail shops
  • Home or domestic kitchens
  • All of the above
____________  is the spread of disease from animal to a person.
  • Non-communicable
  • Genetic
  • Communicable
  • None of these
Tuberculosis is a/an .......... disease.
  • Air borne
  • Non-communicable
  • Endemic
  • All of the above
Food poisoning could be due to the consumption of ________.
  • Spicy food
  • Food spoilt by some microorganisms
  • Heavy diet
  • All of the above
Symptoms of food poisoning arise due to
  • Presence of bacteria or other microbes in food
  • Due to ingestion of toxins contained in food
  • Both A and B
  • None of these
Choose the correct statement:

a) Food must be properly stored to prevent food poisoning.
b) Food poisoning can occur when food is left unrefrigerated for longer period of time.
c) Mishandling of food can also cause food poisoning.
  • a, b
  • b, c
  • a, c
  • All of the above
Lactobacillus is commonly found in:
  • Cake
  • Curd
  • Bread
  • All of the above
Name the diseases caused by protozoa?
  • Malaria
  • Dysentry
  • Both A and B
  • Typhoid
Anthrax is a .......... disease.
  • Fungal
  • Bacterial
  • Viral
  • All of the above
What causes communicable diseases?
  • Spoiled food item
  • Unsanitary conditions
  • Pathogens
  • Dirty objects
Raw vegetable grown using sewage water is also responsible for spread of typhoid.
  • True
  • False
  • Ambiguous
  • Data insufficient
The symptoms of food poisoning begin within .......... of eating contaminated food.
  • 10 days
  • 1-2 days
  • 15 days
  • 7 days
Name the bacteria used in dairy industry.
  • Lactobacillus
  • Bacillus thuringiensis
  • E.coli
  • Both A and B
__________ are classified as microorganisms.
  • Insects
  • Fungi
  • Bacteria
  • Both B and C
Fish can be preserved for longer period of time by adding:
  • Sugar
  • Salt
  • Drying in sunlight
  • Both B and C
Which of the following pairs of microorganisms and diseases is wrongly matched?
  • Bacteria - Malaria
  • Fungus - Athlete's foot
  • Protozoa - Sleeping sickness
  • Virus - Tobacco mosaic disease
How are microorganisms useful to us?
  • They are involved in production of chemical fertilizers.
  • They are used in production of fireworks.
  • They are used in production of soft drinks.
  • They are involved in production of antibiotics. 
Pulse polio oral vaccine is provided only until the age of ___________.
  • $$5$$
  • $$10$$
  • $$15$$
  • $$6$$
The bread becomes soft and porous when the yeast cells are mixed in the lump of dough of wheat flour, because:
  • Yeast is soft and flour also become soft.
  • Yeast produces acetic acid and alcohol which gives softness to the bread.
  • Release of CO$$_2$$ makes the bread spongy.
  • Yeast produces benzoic acid.
Typhoid is classified as a 
  • Viral disease.
  • Genetic disorder.
  • Bacterial disease.
  • Protozoan disease.
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Class 8 Biology Quiz Questions and Answers