Structure of Cell Quiz - CBSE Class 9 Science

Free practice quiz: Structure of Cell (CBSE Class 9 Science). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 9 Science practice quiz has 20 multiple-choice questions on Structure of Cell, and 20 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. What is the basic unit of life in all living organisms?

   1. Tissue
   2. Organ
   3. Cell
   4. Molecule
   Show answer

   Answer: C. Cell

   Cells are considered the basic unit of life because they form the essential structural and functional unit of all living organisms.

2. Which part of the cell is responsible for energy production?

   1. Nucleus
   2. Mitochondria
   3. Chloroplast
   4. Endoplasmic reticulum
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   Answer: B. Mitochondria

   Mitochondria are known as the powerhouse of the cell because they are responsible for producing ATP, the energy currency of the cell.

3. What is the function of chloroplasts in plant cells?

   1. Cell division
   2. Photosynthesis
   3. Protein synthesis
   4. Cellular respiration
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   Answer: B. Photosynthesis

   Chloroplasts contain chlorophyll and are responsible for photosynthesis, the process by which plants convert light energy into chemical energy.

4. Which of the following is not a part of the endomembrane system?

   1. Mitochondria
   2. Endoplasmic reticulum
   3. Golgi apparatus
   4. Lysosomes
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   Answer: A. Mitochondria

   Mitochondria are not part of the endomembrane system; they are involved in energy production and possess their own DNA.

5. Why is the cell membrane described as a fluid mosaic model?

   1. Fixed structure of proteins
   2. Rigid lipid arrangement
   3. Fluidity of lipids and proteins
   4. Lack of flexibility
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   Answer: C. Fluidity of lipids and proteins

   The fluid mosaic model describes the cell membrane as a flexible layer made of lipid molecules and proteins that move between them.

More questions in this quiz

Answers and explanations are in the full quiz.

1. Which structure provides support and protection to plant cells?
2. Which cell structure contains the genetic material?
3. What is the primary function of ribosomes in a cell?
4. Which of the following structures is unique to plant cells?
5. What is the function of lysosomes in an animal cell?
6. Which cellular structure is involved in processing and packaging proteins?
7. Why are mitochondria considered semi-autonomous organelles?
8. Which of the following is the double membrane surrounding the nucleus?
9. What is the primary difference between smooth and rough endoplasmic reticulum?
10. What is the role of peroxisomes in the cell?
11. Which structure is responsible for cell movement?
12. How do plant cells maintain their shape?
13. What role do centrioles play in animal cells?
14. How do cells communicate with each other?
15. Which process occurs in the mitochondria?

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