Class 9 • science • Chapter 5
The Fundamental Unit of Life
True & False Quiz
Cell. Organelle. Membrane.
✓True
✗False
25
Questions
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Ch.5
Chapter
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IX
Class
Why True & False for The Fundamental Unit of Life?
How this format sharpens your conceptual clarity
🔵 The cell is the fundamental unit of all living organisms — every biological process, from metabolism to heredity, occurs within or between cells.
✅ T/F tests prokaryote vs eukaryote, plant vs animal cell differences, organelle functions, osmosis/diffusion, and cell membrane properties.
🎯 Cell wall is present in plant cells, fungi, and bacteria — but NOT in animal cells; plant cells also have a large central vacuole and chloroplasts.
📋
Read each statement carefully. Click True or False — instant feedback with explanation appears. Submit anytime; unattempted questions are marked Skipped.
Q 1
Cells are the basic structural and functional units of living organisms.
Q 2
Robert Hooke discovered living cells while observing a cork slice.
Q 3
All organisms are composed of only one cell.
Q 4
The plasma membrane forms the outer boundary of an animal cell.
Q 5
The cell wall is selectively permeable.
Q 6
Diffusion is the movement of particles from a region of lower concentration to a region of higher concentration.
Q 7
Osmosis involves the movement of water molecules through a selectively permeable membrane.
Q 8
Plant cells placed in pure water generally become turgid.
Q 9
Animal cells become turgid because they possess a rigid cell wall.
Q 10
The nucleus controls various activities of the cell.
Q 11
Chromosomes are composed mainly of DNA and proteins.
Q 12
Prokaryotic cells possess a membrane-bound nucleus.
Q 13
Bacteria are examples of prokaryotic organisms.
Q 14
Ribosomes are the sites of protein synthesis in cells.
Q 15
The smooth endoplasmic reticulum is mainly involved in protein synthesis.
Q 16
The rough endoplasmic reticulum appears rough because ribosomes are attached to its surface.
Q 17
The Golgi apparatus helps in packaging and secretion of cellular materials.
Q 18
Lysosomes contain digestive enzymes capable of breaking down cellular materials.
Q 19
Mitochondria are called the powerhouse of the cell because they release energy in the form of \(ATP\).
Q 20
Chloroplasts are present in all plant cells, including root cells.
Q 21
Leucoplasts are colourless plastids mainly involved in storage of food materials.
Q 22
Vacuoles in mature plant cells are generally small and numerous.
Q 23
Both mitochondria and chloroplasts possess their own DNA.
Q 24
When \(ATP\) breaks down according to \(ATP \rightarrow ADP + P_i + Energy\), energy is released for cellular activities.
Q 25
A cell that possesses a cell wall, chloroplasts and a large central vacuole is most likely an animal cell.
Key Takeaways — The Fundamental Unit of Life
Core facts for CBSE Boards & exams
1
Prokaryotic cell: no membrane-bound nucleus (bacteria, blue-green algae); Eukaryotic: membrane-bound nucleus.
2
Cell membrane (plasma membrane): selectively permeable — controls what enters/exits the cell.
3
Nucleus contains DNA (genetic material); nucleolus produces rRNA; nuclear pores allow transport.
4
Mitochondria: powerhouse — site of cellular respiration producing ATP; has its own DNA.
5
Chloroplast: site of photosynthesis (only in plant cells); contains chlorophyll pigment.
6
Osmosis: movement of water from high water concentration to low through semi-permeable membrane.