The EduNest – Rahul Kumar
PRACTICE SHEET (2026-27)
Cell: The Building block of Life
SUBJECT : Science MAX. MARKS: 30
CLASS: 9 DURATION : 1 hr
SECTION – A (1 mark each)
1. Where is life believed to have originated approximately $3.5$ billion years ago?
a) Deep oceans with high pressure. b) Dry land with high radiation.
c) Frozen glaciers in cold climates. d) Small water pools or hot springs.
2. Who was the first scientist to observe 'cellulae' or small rooms in a cork slice in 1665?
a) Rudolf Virchow. b) Robert Hooke. c) Matthias Schleiden. d) Theodor Schwann.
3. What is the primary function of the large central vacuole in a plant cell?
a) Generating energy for the cell b) Protein synthesis
c) Maintaining turgor pressure d) Packaging proteins into vesicles
4. Which human cell is characterized as being the 'longest cell' and responsible for carrying messages?
a) Smooth Muscle Cell. b) Nerve Cell. c) Bone Cell. c) Red Blood Cell (RBC).
5. The Electron Microscope, developed by Knall and Ruska, uses which of the following for
magnification?
a) Chemical reactions and heat. b) Simple magnifying glass.
c) Electromagnetic lenses and electron beams. d) Glass lenses and sunlight.
6. When a cell is not dividing, DNA exists as an entangled mass of thread-like material called:
a) Genes. b) Chromatin. c) Chromosomes. d) Nucleolus.
7. Which organelle is known as the 'Suicidal Bag' of the cell?
a) Golgi Apparatus. b) Ribosome. c) Lysosome. d) Endoplasmic Reticulum.
8. The Smooth Endoplasmic Reticulum (SER) is primarily responsible for the synthesis of:
a) Fats (lipids) and hormones. b) Digestive enzymes. c) Proteins. d) Cellulose.
9. What happens to a cell when it is placed in a Hypotonic solution?
a) The cell immediately divides. b) The cell remains the same size.
c) The cell swells up and may burst. d) The cell shrinks and wrinkles.
10. According to the notes, which scientist first observed the Golgi apparatus in 1839?
a) Robert Hooke. b) Knall and Ruska. C) Rudolf Virchow. d) Camillo Golgi.
SECTION – B (2 marks each)
11. Distinguish between Rough Endoplasmic Reticulum and Smooth Endoplasmic Reticulum based on
their structure and primary function.
12. Why is the cell called the "Structural and Functional unit of life"? Explain with reference to the Latin
meaning of the word 'Cell'.
13. Compare the magnification and resolution capabilities of a Light Microscope versus an Electron
Microscope.
SECTION – C (3 marks each)
14. "Division of Labour" is a hallmark of multicellular organisms. Explain this statement using examples
of different cell types found in the human body.
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