Class 9 Science Chapter 2: Cell: The Building Block of Life — practice questions with answers
Free practice for Class 9 Science, Chapter 2: Cell: The Building Block of Life. Try the solved questions below, then take a free test with instant marking and explanations.
57 questions14 easy, 31 medium, 12 hardNCERT · CBSE · State boards
Sample questions with solutions
Q1. Who first observed and named ‘cells’, while looking at a thin slice of cork in 1665?
- Robert Hooke
- Rudolf Virchow
- Theodor Schwann
- J. Craig Venter
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Answer: A. Robert Hooke
Why: He used a self-designed microscope. [p.9]
Why: He used a self-designed microscope. [p.9]
Q2. A microscope has a 10X eyepiece and a 40X objective lens. What is the total magnification?
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Answer: 400 (± 0)
Why: Total = eyepiece × objective = 400X. [p.10]
Why: Total = eyepiece × objective = 400X. [p.10]
Q3. The cell membrane is described as selectively permeable. What does this mean?
- It lets some substances pass through and blocks others
- It lets everything pass
- It blocks everything
- It is made of cellulose
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Answer: A. It lets some substances pass through and blocks others
Why: Also called the plasma membrane. [p.11]
Why: Also called the plasma membrane. [p.11]
Q4. What is osmosis?
- Movement of water across a selectively permeable membrane from a dilute to a concentrated solution
- Movement of salt into a cell
- Breakdown of glucose
- Division of a cell
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Answer: A. Movement of water across a selectively permeable membrane from a dilute to a concentrated solution
Why: It is diffusion of water. [p.12]
Why: It is diffusion of water. [p.12]
Q5. Cells without a well-defined nucleus, such as bacteria, are called ______.
- prokaryotic
- eukaryotic
- multicellular
- plastids
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Answer: A. prokaryotic
Why: Their genetic material lies in the nucleoid. [p.14–15]
Why: Their genetic material lies in the nucleoid. [p.14–15]
Q6. Why does the rough endoplasmic reticulum look rough under an electron microscope?
- Ribosomes are attached to its surface
- It contains cellulose
- It has chlorophyll
- It is folded into cristae
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Answer: A. Ribosomes are attached to its surface
Why: RER makes and secretes proteins. [p.17]
Why: RER makes and secretes proteins. [p.17]
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Frequently asked questions
How many practice questions are there for Class 9 Science Chapter 2: Cell: The Building Block of Life?
57 questions (14 easy, 31 medium, 12 hard). A few are solved on this page; the free test shows the answer and explanation for every question after you submit.
Is this chapter from the NCERT book?
Yes — it follows the NCERT Class 9 Science syllabus, used by CBSE and many state boards.