Class 8 Science — Chapter 2: The Invisible Living World: Beyond Our Naked Eye
72 practice questions · 24 Easy · 24 Medium · 24 Hard
Practise the most important Class 8 Science questions from Chapter 2, "The Invisible Living World: Beyond Our Naked Eye" — 72 NCERT-aligned multiple-choice questions with answers and explanations. The set is split into 24 Easy, 24 Medium and 24 Hard, so you can warm up on the fundamentals and then push into the exam-level problems that separate top scorers in CBSE Board exams.
"The Invisible Living World: Beyond Our Naked Eye" is one of the chapters where concept clarity across physics, chemistry and biology basics really pays off. Each MCQ on this chapter is timed and uses exam-grade marking (+4 correct, −1 wrong, 0 skipped), training the same negative-marking accuracy-under-pressure that real papers demand. Every question carries a short explanation, so a wrong answer becomes a quick lesson rather than a dead end — the fastest way to close gaps before a test.
Use this chapter as targeted revision: attempt the Easy set first to confirm your basics on The Invisible Living World: Beyond Our Naked Eye, then move to Medium and Hard to test application and problem-solving. Your accuracy, streaks and XP save automatically, and the chapter feeds into your overall Class 8 Science mastery score. A sample question is shown below; sign in free to see its answer and practise all 72.
Key concepts: The Invisible Living World: Beyond Our Naked Eye (Class 8 Science)
This chapter opens the hidden world of microorganisms — living things too small to see without a microscope. You meet the main groups (bacteria, fungi, protozoa, algae and viruses) and learn which are single-celled and which are many-celled. Microbes are both friends and foes: they decompose waste into manure, fix nitrogen in legume roots (Rhizobium), and ferment food (yeast makes dough rise with carbon dioxide, Lactobacillus makes curd and idli batter), yet some spoil food or cause disease — which is why we preserve food with salt, sugar, drying and cold.
- Microorganism
- A living thing too small to be seen with the naked eye; a microscope is needed to view it. Microbes live almost everywhere — in soil, water, air and inside our bodies.
- Unicellular vs multicellular
- Unicellular organisms are made of a single cell (bacteria, protozoa, yeast); multicellular ones have many cells (moulds, algae, plants, animals).
- Bacteria
- Single-celled microbes that keep their genetic material in a nucleoid rather than a membrane-bound nucleus; some are helpful (curd, manure) and some are harmful.
- Fungi
- Microbes that can be single-celled, like yeast, or many-celled, like the moulds that grow on stale bread.
Try a sample question
One free sample from this chapter — sign in to check your answer and practise the rest.
In the yeast-and-sugar balloon experiment, the balloon inflates because yeast:
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See the answer and solution to this question, then practise all 72 questions (24 Easy · 24 Medium · 24 Hard) with timed scoring and instant feedback, plus the complete key-concept notes, formulas & exam tips. Sign in with Google — no card needed.
Start this chapter free →The Invisible Living World: Beyond Our Naked Eye — FAQs
What are the key concepts in Class 8 Science The Invisible Living World: Beyond Our Naked Eye?+
This chapter opens the hidden world of microorganisms — living things too small to see without a microscope. You meet the main groups (bacteria, fungi, protozoa, algae and viruses) and learn which are single-celled and which are many-celled. Microbes are both friends and foes: they decompose waste into manure, fix nitrogen in legume roots (Rhizobium), and ferment food (yeast makes dough rise with carbon dioxide, Lactobacillus makes curd and idli batter), yet some spoil food or cause disease — which is why we preserve food with salt, sugar, drying and cold. Key ideas include Microorganism, Unicellular vs multicellular, Bacteria, Fungi.
What does Class 8 Science Chapter 2 (The Invisible Living World: Beyond Our Naked Eye) cover on XamBaaz?+
It covers 72 NCERT-aligned MCQs on "The Invisible Living World: Beyond Our Naked Eye" — 24 Easy, 24 Medium and 24 Hard — each with a timed quiz and an instant explanation, suitable for CBSE Board exams.
Are these "The Invisible Living World: Beyond Our Naked Eye" questions free to practise?+
Yes — sign in with Google to practise "The Invisible Living World: Beyond Our Naked Eye" free. Full unlimited access is ₹999/year (limited-time launch price), with no per-chapter charges.
How should I revise "The Invisible Living World: Beyond Our Naked Eye" for the exam?+
Start with the Easy quiz to confirm your fundamentals, then attempt Medium and Hard for application-level practice. Review each explanation, retry the questions you miss, and track your accuracy on this chapter until it is consistently high.
Are these "The Invisible Living World: Beyond Our Naked Eye" MCQs available with answers?+
Yes. This page shows one sample question so you can see the format; sign in free with Google to reveal the correct option and a step-by-step "Why" explanation for it, then practise all 72 questions with instant scoring.
Is there negative marking in the "The Invisible Living World: Beyond Our Naked Eye" quizzes?+
Yes — the timed quizzes use exam-grade marking: +4 for a correct answer, −1 for a wrong one and 0 for a skipped question, so you practise the same negative-marking discipline as CBSE Board exams.
Are these important questions for The Invisible Living World: Beyond Our Naked Eye?+
The set is curated to the NCERT syllabus and weighted toward the question patterns that actually appear in CBSE Board exams, across Easy, Medium and Hard — so it doubles as an "important questions" revision list for "The Invisible Living World: Beyond Our Naked Eye".