Class 9 Science — Chapter 1: The Fundamental Unit of Life
90 practice questions · 30 Easy · 30 Medium · 30 Hard
Practise Class 9 Science Chapter 1, "The Fundamental Unit of Life", with 90 NCERT-aligned multiple-choice questions. The set is split into 30 Easy, 30 Medium and 30 Hard questions, so you can warm up on the fundamentals and then push into the exam-level problems that separate top scorers in CBSE Board exams and the JEE & NEET foundation years.
"The Fundamental Unit of Life" 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 (+2 correct, −1 wrong, 0 skipped), training the same 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 Fundamental Unit of Life, 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 9 Science mastery score. A few sample questions are shown below; sign in free to practise all 90.
Key concepts: The Fundamental Unit of Life (Class 9 Science)
This chapter explains that matter is made of tiny particles, how their arrangement gives the three states of matter, and how temperature and pressure cause changes of state.
- Particle nature of matter
- Matter is made of very small particles that have space between them, are continuously moving, and attract one another.
- States of matter
- Solids have fixed shape and volume; liquids have fixed volume but take the container's shape; gases have neither, filling any container.
- Change of state
- Heating overcomes inter-particle forces: melting (solid→liquid) and boiling (liquid→gas); cooling reverses them. Temperature stays constant during a change of state.
- Latent heat
- The hidden heat absorbed or released during a change of state without a change in temperature (latent heat of fusion and of vaporisation).
- Evaporation
- Surface liquid turning to vapour below the boiling point; it causes cooling and increases with temperature, surface area, wind and lower humidity.
- Sublimation
- A solid changing directly to gas (e.g. camphor, dry ice) without becoming a liquid.
Key formulas — The Fundamental Unit of Life
💡 Exam tips for The Fundamental Unit of Life
- Temperature stays constant while a substance changes state — the heat goes into breaking particle bonds (latent heat).
- Evaporation causes cooling because the fastest particles escape, lowering the average energy left behind.
Sample questions
Cells were first discovered by:
Robert Hooke (1665) observed cells in cork using a compound microscope.
The control centre of a eukaryotic cell is the:
Nucleus contains DNA — it controls cellular activities.
When a cell is placed in a hypertonic solution, it will:
Water leaves the cell by osmosis (toward higher solute concentration outside) → cell shrinks.
The Fundamental Unit of Life — FAQs
What are the key concepts in Class 9 Science The Fundamental Unit of Life?+
This chapter explains that matter is made of tiny particles, how their arrangement gives the three states of matter, and how temperature and pressure cause changes of state. Key ideas include Particle nature of matter, States of matter, Change of state, Latent heat, Evaporation.
What does Class 9 Science Chapter 1 (The Fundamental Unit of Life) cover on XamBaaz?+
It covers 90 NCERT-aligned MCQs on "The Fundamental Unit of Life" — 30 Easy, 30 Medium and 30 Hard — each with a timed quiz and an instant explanation, suitable for CBSE Board exams and the JEE & NEET foundation years.
Are these "The Fundamental Unit of Life" questions free to practise?+
Yes — sign in with Google to practise "The Fundamental Unit of Life" free. Full unlimited access is ₹999/year (limited-time launch price), with no per-chapter charges.
How should I revise "The Fundamental Unit of Life" 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.
Practise all 90 questions free
Timed quizzes, instant scoring, streaks and XP. Sign in with Google — no card needed.
Start this chapter free →