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.

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 quizzes

• Diversity in Living World
• Human Physiology
• Plant Physiology
• Structural Organization in Animals and Plants

Browse all Biology quizzes