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.

Sample questions

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

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

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