Cell: Structure and Functions Quiz - CBSE Class 8 Science

Free practice quiz: Cell: Structure and Functions (CBSE Class 8 Science). 19 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 8 Science practice quiz has 19 multiple-choice questions on Cell: Structure and Functions, and 19 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 of the following is NOT a part of a plant cell?

   1. Cell wall
   2. Chloroplast
   3. Nucleus
   4. Centrioles
   Show answer

   Answer: D. Centrioles

   Centrioles are found in animal cells, not plant cells. Plant cells have cell walls, chloroplasts, and nuclei.

2. Which organelle is responsible for protein synthesis?

   1. Golgi apparatus
   2. Ribosomes
   3. Endoplasmic reticulum
   4. Lysosomes
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   Answer: B. Ribosomes

   Ribosomes are the sites of protein synthesis in the cell.

3. How does the endoplasmic reticulum contribute to protein synthesis and transport?

   1. It synthesizes proteins and directly exports them from the cell.
   2. It synthesizes lipids and stores them.
   3. It modifies and transports proteins synthesized by ribosomes.
   4. It is involved in cellular respiration.
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   Answer: C. It modifies and transports proteins synthesized by ribosomes.

   The endoplasmic reticulum plays a crucial role in protein folding, modification, and transport within the cell.

4. Explain the process of facilitated diffusion and its difference from simple diffusion.

   1. Both are active transport processes.
   2. Simple diffusion requires energy, facilitated diffusion does not.
   3. Facilitated diffusion uses transport proteins, while simple diffusion does not.
   4. There is no difference between them.
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   Answer: C. Facilitated diffusion uses transport proteins, while simple diffusion does not.

   Facilitated diffusion uses membrane proteins to help transport substances across the membrane, unlike simple diffusion which relies on concentration gradients alone.

5. Analyze the role of various organelles in maintaining cellular homeostasis, considering their interactions and interdependence.

   1. Organelles function independently of each other.
   2. Organelles interact only during cell division.
   3. Organelles are interdependent, and their coordinated actions maintain cellular homeostasis. For example, the ER, Golgi apparatus, and lysosomes work together in protein synthesis, modification, and degradation.
   4. Cellular homeostasis is solely maintained by the cell membrane.
   Show answer

   Answer: C. Organelles are interdependent, and their coordinated actions maintain cellular homeostasis. For example, the ER, Golgi apparatus, and lysosomes work together in protein synthesis, modification, and degradation.

   Maintaining cellular homeostasis involves a complex interplay of various organelles, where their coordinated function is essential for cell survival and proper functioning.

More questions in this quiz

Answers and explanations are in the full quiz.

1. What is the main function of the cell membrane?
2. What is the function of the mitochondrion?
3. Describe the difference between prokaryotic and eukaryotic cells.
4. What is the role of the vacuole in plant cells?
5. What is the significance of the cell wall in plant cells?
6. Explain the structure and function of the Golgi apparatus.
7. Compare and contrast the functions of lysosomes and peroxisomes.
8. Describe the role of the cytoskeleton in maintaining cell shape and movement.
9. Discuss the role of the nucleus in regulating gene expression.
10. Explain how the cell cycle ensures accurate DNA replication and cell division.
11. Describe the differences in cell structure and function between plant and animal cells and relate these differences to their respective roles in multicellular organisms.
12. Critically evaluate the impact of various cellular processes (e.g., endocytosis, exocytosis, active transport) on maintaining cellular equilibrium in dynamic environments.
13. Design an experiment to investigate the effect of different concentrations of a solute on the rate of osmosis in plant cells, explaining the methodology and expected results.
14. Compare and contrast the mechanisms and significance of different types of cell transport (passive and active) in maintaining cellular function and responding to environmental changes, providing specific examples.

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