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.

Sample questions

1. Which of the following is NOT a part of a plant cell?

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

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