Cell Structure and Function Quiz - CBSE Class 11 Science

Free practice quiz: Cell Structure and Function (CBSE Class 11 Science). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 11 Science practice quiz has 20 multiple-choice questions on Cell Structure and Function, 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 of the following is NOT a part of the cell membrane?

   1. Phospholipids
   2. Proteins
   3. Nucleic acids
   4. Carbohydrates
   Show answer

   Answer: C. Nucleic acids

   The cell membrane is primarily composed of a phospholipid bilayer with embedded proteins and carbohydrates. Nucleic acids are found within the nucleus and other organelles.

2. Which organelle is the powerhouse of the cell?

   1. Nucleus
   2. Mitochondria
   3. Chloroplast
   4. Vacuole
   Show answer

   Answer: B. Mitochondria

   Mitochondria are responsible for cellular respiration, generating ATP (energy).

3. Explain the process of active transport across the cell membrane.

   1. Movement of substances down their concentration gradient
   2. Movement of substances against their concentration gradient requiring energy
   3. Movement of water across a selectively permeable membrane
   4. Movement of substances through protein channels
   Show answer

   Answer: B. Movement of substances against their concentration gradient requiring energy

   Active transport moves substances against their concentration gradient, requiring energy input (ATP).

4. What is the role of the cytoskeleton in maintaining cell shape and movement?

   1. The cytoskeleton plays no role in cell shape or movement
   2. The cytoskeleton helps maintain cell shape but not movement
   3. The cytoskeleton helps maintain cell movement but not shape
   4. The cytoskeleton is a network of protein filaments that maintain cell shape and facilitate movement
   Show answer

   Answer: D. The cytoskeleton is a network of protein filaments that maintain cell shape and facilitate movement

   The cytoskeleton provides structural support and facilitates movement within the cell.

5. Explain the role of the vacuole in maintaining turgor pressure in plant cells.

   1. Vacuoles do not contribute to turgor pressure
   2. Vacuoles contribute to turgor pressure by storing water
   3. Vacuoles contribute to turgor pressure by storing nutrients
   4. Vacuoles contribute to turgor pressure by storing waste
   Show answer

   Answer: B. Vacuoles contribute to turgor pressure by storing water

   The large central vacuole in plant cells maintains turgor pressure by storing water.

More questions in this quiz

Answers and explanations are in the full quiz.

1. What is the main function of the cell wall in plant cells?
2. Which organelle is responsible for protein synthesis?
3. What is the function of the Golgi apparatus?
4. What is the difference between prokaryotic and eukaryotic cells?
5. Describe the fluid mosaic model of the cell membrane.
6. What is the role of lysosomes in the cell?
7. What is osmosis?
8. Explain the role of the endoplasmic reticulum (ER) in protein synthesis and transport.
9. Compare and contrast the structure and function of plant and animal cells.
10. Explain the process of facilitated diffusion.
11. Discuss the importance of the nuclear envelope in regulating gene expression.
12. How do tight junctions, gap junctions, and desmosomes contribute to cell-to-cell communication and adhesion?
13. Describe the process of exocytosis and its significance in cellular secretion.
14. Discuss the various types of cell signaling and their mechanisms.
15. Explain the role of membrane receptors in signal transduction pathways.

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