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🧾 CBSE · Class 8

Class 8 Science: The Invisible Living World Beyond Our Naked Eye Worksheet (with Answers)

A free, print-ready worksheet on The Invisible Living World Beyond Our Naked Eye for CBSE Class 8 Science, with a matching answer key. Use the sample below, or build your own with the exact mix of questions you need — no login, no ads.

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Sample worksheet

7 of 17 questions from this chapter. Generate your own for the full set, more variations, and a clean print layout.

  1. 1. Microorganisms are seen using a:
    • (a) telescope
    • (b) microscope
    • (c) periscope
    • (d) magnet
  2. 2. Which reproduces only inside a host cell?
    • (a) bacteria
    • (b) fungi
    • (c) protozoa
    • (d) virus
  3. 3. Curd is formed from milk by:
    • (a) yeast
    • (b) viruses
    • (c) bacteria
    • (d) algae
  4. 4. Yeast is used in baking because it causes:
    • (a) fermentation
    • (b) freezing
    • (c) rusting
    • (d) filtration
  5. 5. Name the main groups of microorganisms.
  6. 6. Give two useful roles of microbes.
  7. 7. Describe four useful roles of microorganisms.
View answers
  1. 1. (b) microscope — A microscope magnifies tiny microbes.
  2. 2. (d) virus — Viruses multiply only inside host cells.
  3. 3. (c) bacteria — Bacteria convert milk into curd.
  4. 4. (a) fermentation — Yeast ferments dough, making it rise.
  5. 5. Bacteria, fungi, protozoa and microscopic algae, plus viruses as a special group.
  6. 6. Making curd and bread (fermentation) and fixing nitrogen in soil (also making medicines).
  7. 7. First, in food: yeast ferments dough to make bread rise and bacteria set milk into curd. Second, in medicine: microbes are used to produce antibiotics and to prepare vaccines. Third, in farming: certain soil bacteria fix atmospheric nitrogen into a form plants can use, improving soil fertility. Fourth, in nature: decomposer microbes break down dead plants and animals, returning nutrients to the soil and keeping ecosystems running.
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FAQ

Is this Class 8 Science worksheet on The Invisible Living World Beyond Our Naked Eye free?
Yes — it is completely free, with no login and no ads. You can print it or save it as a PDF, and generate unlimited variations.
Does the The Invisible Living World Beyond Our Naked Eye worksheet come with answers?
Yes. Every worksheet has a separate answer key with the correct answers, short explanations and marks, so it is ready for marking.
Can I choose how many questions and which types?
Yes. Open the generator for this chapter and set how many MCQs, short, long and HOTS questions you want; totals and marks update live, and you can swap any single question.
Which board and class is this for?
This worksheet is aligned to CBSE Class 8 Science, chapter “The Invisible Living World Beyond Our Naked Eye”.