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.

Sample questions

1. Which part of the cell is known as the powerhouse?

   1. Nucleus
   2. Mitochondria
   3. Ribosomes
   4. Endoplasmic reticulum
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   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
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   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
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   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
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   Answer: A. Presence of ribosomes

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

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