CBSE Class 9 Science
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The Fundamental Unit of Life — Question 8
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Question Question 8
What is osmosis?
Osmosis is the movement of water molecules from their region of higher concentration (dilute solution or with a lower solute concentration) to their region of lower concentration (concentrated solution or with a higher solute concentration) through a semi permeable membrane.
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Science | Chapter 5: The Fundamental Unit of LifeWeb Content — Quick Reference
Chapter 5: The Fundamental Unit of Life — Quick Reference
Quick Revision Points
- Cell theory: all organisms made of cells; cell = basic unit; cells from pre-existing cells
- Prokaryotic (no nuclear membrane, bacteria) vs Eukaryotic (true nucleus, plants/animals)
- Plasma membrane: selectively permeable, lipid bilayer
- Osmosis: water from dilute → concentrated through semipermeable membrane
- Organelles: Nucleus (control), Mitochondria (powerhouse), ER (transport), Golgi (packaging), Lysosomes (suicide bags), Plastids (photosynthesis), Vacuoles (storage)
- Plant cell: cell wall, large vacuole, plastids present. Animal cell: no cell wall, centrioles present
Exam Tips for Chapter 5
- Read the detailed chapter notes for complete coverage of all NCERT topics.
- Practice all NCERT in-text and back exercise questions — they are frequently asked in exams.
- Focus on comparison tables, diagrams, and definitions — these are high-scoring areas.
- For numericals (if applicable), practice at least 20 problems of varying difficulty.
- Refer to the practice question bank (200+ questions) for thorough preparation.
Related Resources
- Detailed Notes: ch05-the-fundamental-unit-of-life.html
- Practice Questions: 100+ questions with answers in 05-practice-questions/
- Chapter Test: 30-mark test paper in 06-tests/chapter-tests-30marks/
- Formula Sheet: Complete formula reference in 03-teacher-aid/formula-sheet.html