Harmful Microorganisms — Homi Bhabha Class 6 Biology MCQs with Solutions
Free Homi Bhabha Class 6 Biology Harmful Microorganisms MCQs with step-by-step solutions (10 questions). Part of Cell & Microorganisms. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Harmful Microorganisms · easy · theory
Microorganisms that cause diseases are commonly called:
A. Gems
B. Grains
C. Germs ✓ Correct
D. Gums
Solution: Disease-causing microorganisms are commonly known as germs.
Q2 — Harmful Microorganisms · easy · theory
The greenish, fuzzy growth seen on stale bread left for many days is caused by a:
A. fungus (mould) ✓ Correct
B. fish
C. fern
D. frog
Solution: A mould, which is a fungus, grows on stale bread and spoils it.
Q3 — Harmful Microorganisms · easy · theory
Malaria is spread from one person to another by the bite of a:
A. housefly
B. butterfly
C. bee
D. mosquito ✓ Correct
Solution: The malaria germ is carried and spread by mosquito bites.
Q4 — Harmful Microorganisms · easy · theory
Which is a simple way to protect food from spoiling by microorganisms?
A. Keeping it in a refrigerator ✓ Correct
B. Adding extra water to it
C. Leaving it in warm sunlight
D. Keeping it open in the air
Solution: A refrigerator keeps food cold, which stops microorganisms from growing quickly.
Q5 — Harmful Microorganisms · medium · theory
Diseases like the common cold and flu spread mainly through the ___ when a sick person coughs or sneezes.
A. metal
B. air ✓ Correct
C. soil
D. glass
Solution: Cold and flu germs travel through the air in tiny droplets from coughs and sneezes.
Q6 — Harmful Microorganisms · medium · theory
Drinking dirty, germ-filled water can cause a disease such as:
A. a bone fracture
B. toothache from sweets
C. a headache from noise
D. cholera ✓ Correct
Solution: Cholera is caused by germs in dirty water and affects the stomach.
Q7 — Harmful Microorganisms · medium · theory
Salting and drying fish helps to keep it fresh for a long time because these methods:
A. make it heavier
B. add vitamins to it
C. add bright colour to it
D. stop the growth of microorganisms ✓ Correct
Solution: Salting and drying remove water, so microorganisms cannot grow and spoil the fish.
Q8 — Harmful Microorganisms · medium · theory
A dose or injection that protects our body against a particular disease is called a:
A. vitamin
B. vinegar
C. vacuum
D. vaccine ✓ Correct
Solution: A vaccine trains the body to fight off a disease before it can make us ill.
Q9 — Harmful Microorganisms · hard · theory
Why does food kept in a refrigerator stay fresh longer than food left on the table?
A. Cold makes the food heavier
B. Cold adds nutrients to the food
C. Cold kills all insects
D. Cold slows down the growth of microorganisms ✓ Correct
Solution: Microorganisms grow slowly in the cold, so refrigerated food spoils much later.
Q10 — Harmful Microorganisms · hard · theory
Which set lists ONLY diseases caused by microorganisms?
A. Cholera, malaria and tuberculosis ✓ Correct
B. Hunger, thirst and sleep
C. Blindness from an injury
D. Fracture, sprain and cut
Solution: Cholera, malaria and tuberculosis are all caused by microorganisms; the others are not.