Structure of Cells Quiz - CBSE Class 8 Science

Free practice quiz: Structure of Cells (CBSE Class 8 Science). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 8 Science practice quiz has 20 multiple-choice questions on Structure of Cells, 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. Which part of the cell is known as the powerhouse?

   1. Nucleus
   2. Mitochondria
   3. Ribosomes
   4. Endoplasmic reticulum
   Show answer

   Answer: B. Mitochondria

   Mitochondria are known as the powerhouse of the cell because they produce energy in the form of ATP through cellular respiration.

2. What is the jelly-like substance inside the cell called?

   1. Nucleoplasm
   2. Cytoplasm
   3. Chloroplasm
   4. Cell sap
   Show answer

   Answer: B. Cytoplasm

   Cytoplasm is the fluid that fills the cell and contains all the organelles.

3. What is the key difference between prokaryotic and eukaryotic cells?

   1. Eukaryotic cells have a nucleus; prokaryotic cells do not
   2. Prokaryotic cells are larger
   3. Eukaryotic cells are always single-celled
   4. Prokaryotic cells lack DNA
   Show answer

   Answer: A. Eukaryotic cells have a nucleus; prokaryotic cells do not

   The main difference is that prokaryotic cells lack a true nucleus, while eukaryotic cells have a well-defined nucleus.

4. What role do lysosomes perform in a cell?

   1. Energy production
   2. Digestion of waste materials
   3. Photosynthesis
   4. Storage of nutrients
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   Answer: B. Digestion of waste materials

   Lysosomes contain enzymes that break down waste materials and cellular debris within the cell.

5. What defines the difference between rough and smooth endoplasmic reticulum?

   1. Presence of ribosomes
   2. Shape and size
   3. Location in the cell
   4. Function in energy production
   Show answer

   Answer: A. Presence of ribosomes

   Rough endoplasmic reticulum has ribosomes on its surface, giving it a rough appearance, while smooth ER does not.

More questions in this quiz

Answers and explanations are in the full quiz.

1. What is the function of the cell membrane?
2. What structure within the cell contains genetic material?
3. Which organelle is involved in protein synthesis?
4. Which of the following is NOT a function of the endoplasmic reticulum?
5. What is the primary role of vacuoles in plant cells?
6. Which type of cell has a cell wall?
7. Which structure is mainly involved in detoxifying harmful substances in the cell?
8. What is the main function of the Golgi apparatus?
9. Which of the following organelles is found in both plant and animal cells?
10. How do chloroplasts benefit plant cells?
11. What is a cytoskeleton's role within a cell?
12. Why are ribosomes sometimes referred to as 'protein factories'?
13. What is the significance of the fluid mosaic model?
14. Which cellular component is primarily responsible for cellular respiration?
15. What role does the nucleolus play in the cell?

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