Types of microorganisms — Class 8 CBSE Science MCQs with Solutions
Free Class 8 CBSE Science Types of microorganisms MCQs with step-by-step solutions (12 questions). Part of Microorganisms: Friend and Foe. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Types of microorganisms · easy · theory
Amoeba and Paramecium are examples of which group of microorganisms?
A. Protozoa ✓ Correct
B. Fungi
C. Algae
D. Bacteria
Solution: Amoeba and Paramecium are classic examples of protozoa, one of the four major groups of microorganisms.
Q2 — Types of microorganisms · easy · theory
Most microorganisms are too small to be seen with the unaided eye and can only be viewed with a:
A. Microscope ✓ Correct
B. Magnifying glass
C. Telescope
D. Pair of binoculars
Solution: Most microorganisms are too small to see with the naked eye and need a microscope; only a few, such as bread fungus, can be seen with a magnifying glass.
Q3 — Types of microorganisms · easy · theory
The four major groups of microorganisms are bacteria, fungi, protozoa and some:
A. Algae ✓ Correct
B. Viruses
C. Yeasts
D. Moulds
Solution: The four major groups are bacteria, fungi, protozoa and some algae. Viruses are microscopic too, but they are not counted among these four groups.
Q4 — Types of microorganisms · easy · theory
Chlamydomonas and Spirogyra are examples of which group of microorganisms?
A. Algae ✓ Correct
B. Protozoa
C. Fungi
D. Bacteria
Solution: Chlamydomonas and Spirogyra are named in the chapter as examples of algae.
Q5 — Types of microorganisms · medium · theory
In what important way are viruses different from bacteria, fungi and protozoa?
A. They reproduce only inside the cells of a host organism ✓ Correct
B. They reproduce on their own in soil and water, needing no host
C. They are so large that they can be seen with the naked eye
D. They belong to the group called algae
Solution: Although viruses are microscopic, they are different because they reproduce only inside the cells of a host, such as a bacterium, plant or animal.
Q6 — Types of microorganisms · medium · theory
Which of the following diseases is caused by a protozoan?
A. Malaria ✓ Correct
B. Typhoid
C. Tuberculosis
D. Chicken pox
Solution: Malaria (along with dysentery) is caused by protozoa, whereas typhoid and tuberculosis are bacterial and chicken pox is viral.
Q7 — Types of microorganisms · medium · theory
Bread mould, Penicillium and Aspergillus all belong to which group of microorganisms?
A. Fungi ✓ Correct
B. Algae
C. Protozoa
D. Bacteria
Solution: Bread mould, Penicillium and Aspergillus are given in the chapter as examples of fungi.
Q8 — Types of microorganisms · medium · theory
Typhoid and tuberculosis are both caused by the same kind of microorganism. That microorganism is a:
A. Bacterium ✓ Correct
B. Virus
C. Protozoan
D. Fungus
Solution: Both typhoid and tuberculosis are caused by bacteria.
Q9 — Types of microorganisms · medium · theory
Which microorganism can often be seen with just a magnifying glass rather than needing a microscope?
A. Bread fungus (mould) ✓ Correct
B. Amoeba
C. A bacterium
D. A virus
Solution: The chapter notes that some microorganisms such as bread fungus can be seen with a magnifying glass, while others need a microscope.
Q10 — Types of microorganisms · hard · theory
Which one of the following statements about microorganisms is correct?
A. Some microorganisms are single-celled, such as bacteria, while many algae and fungi are multicellular ✓ Correct
B. All microorganisms are single-celled and can be seen with the naked eye
C. Microorganisms live only inside the bodies of humans and animals
D. All microorganisms belong to a single group called algae
Solution: Microorganisms may be single-celled (like bacteria) or multicellular (like many algae and fungi), and they live almost everywhere, from ice-cold climates to hot springs, not only inside animals.
Q11 — Types of microorganisms · hard · theory
Which of the following correctly pairs a disease with the type of microbe that causes it?
A. Chicken pox is caused by a virus ✓ Correct
B. Malaria is caused by a bacterium
C. Typhoid is caused by a protozoan
D. Tuberculosis is caused by a fungus
Solution: Chicken pox is caused by a virus. Malaria is caused by a protozoan (not a bacterium), typhoid by a bacterium (not a protozoan), and tuberculosis by a bacterium (not a fungus).
Q12 — Types of microorganisms · hard · theory
Riya says malaria and dysentery are caused by the same group of microbes; Sameer says typhoid and tuberculosis are caused by the same group. Who is correct?
A. Both Riya and Sameer ✓ Correct
B. Only Riya
C. Only Sameer
D. Neither of them
Solution: Malaria and dysentery are both caused by protozoa, and typhoid and tuberculosis are both caused by bacteria, so both students are correct.