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Class-8-Science-Cell – Structure and Function (ISO)

  1. Which organelle is known as the “powerhouse of the cell”?
    • A) Nucleus
    • B) Mitochondria
    • C) Ribosome
    • D) Cell membrane
  2. What does the cell membrane do?
    • A) Produces energy
    • B) Controls what enters and exits the cell
    • C) Stores genetic material
    • D) Digests food
  3. Which organelle modifies and packages proteins?
    • A) Golgi apparatus
    • B) Lysosome
    • C) Ribosome
    • D) Mitochondria
  4. Where is the cell’s genetic material located?
    • A) Cytoplasm
    • B) Nucleus
    • C) Ribosome
    • D) Golgi apparatus
  5. What is the main job of ribosomes?
    • A) Make energy
    • B) Build proteins
    • C) Store waste
    • D) Transport substances
  6. Which organelle is involved in lipid synthesis and detoxification?
    • A) Rough endoplasmic reticulum
    • B) Smooth endoplasmic reticulum
    • C) Lysosome
    • D) Golgi apparatus
  7. What do lysosomes do?
    • A) Break down waste
    • B) Store genetic information
    • C) Produce proteins
    • D) Capture sunlight
  8. What provides support and structure in plant cells?
    • A) Cell membrane
    • B) Cell wall
    • C) Cytoskeleton
    • D) Endoplasmic reticulum
  9. Which cell junction prevents leakage between cells?
    • A) Desmosome
    • B) Tight junction
    • C) Gap junction
    • D) Adherens junction
  10. What does the nucleolus produce?
    • A) ATP
    • B) Ribosomal RNA (rRNA)
    • C) Lipids
    • D) Enzymes
  11. Which organelle is the site of cellular respiration?
    • A) Ribosome
    • B) Mitochondria
    • C) Golgi apparatus
    • D) Lysosome
  12. What does the cytoskeleton do?
    • A) Supports cell shape
    • B) Produces proteins
    • C) Stores energy
    • D) Digests nutrients
  13. In which organelle does photosynthesis occur?
    • A) Mitochondria
    • B) Chloroplast
    • C) Golgi apparatus
    • D) Lysosome
  14. What is the rough endoplasmic reticulum responsible for?
    • A) Lipid synthesis
    • B) Protein synthesis and modification
    • C) Waste breakdown
    • D) Energy production
  15. What structure helps with cell division?
    • A) Golgi apparatus
    • B) Ribosome
    • C) Centriole
    • D) Lysosome
  16. How do prokaryotic cells differ from eukaryotic cells?
    • A) Prokaryotic cells lack a nucleus
    • B) Prokaryotic cells have a nucleus
    • C) Eukaryotic cells have a cell wall
    • D) Prokaryotic cells have mitochondria
  17. What is the main function of the cell membrane’s lipid bilayer?
    • A) To control substance movement
    • B) To store nutrients
    • C) To synthesize proteins
    • D) To provide energy
  18. What does the central vacuole do in plant cells?
    • A) Stores nutrients and waste
    • B) Synthesizes proteins
    • C) Conducts cellular respiration
    • D) Produces ATP
  19. Which organelle contains enzymes to break down waste?
    • A) Ribosome
    • B) Lysosome
    • C) Peroxisome
    • D) Mitochondria
  20. Where is ATP produced?
    • A) Ribosome
    • B) Mitochondria
    • C) Endoplasmic reticulum
    • D) Golgi apparatus
  21. What does the phospholipid bilayer of the cell membrane do?
    • A) Acts as a barrier
    • B) Stores genetic material
    • C) Synthesizes proteins
    • D) Transports lipids
  22. Which organelle breaks down fatty acids and detoxifies substances?
    • A) Rough endoplasmic reticulum
    • B) Smooth endoplasmic reticulum
    • C) Golgi apparatus
    • D) Lysosome
  23. What does the nucleus do?
    • A) Produces ATP
    • B) Stores genetic information
    • C) Breaks down waste
    • D) Synthesizes lipids
  24. What structure in the cell has a double membrane and is involved in energy conversion?
    • A) Chloroplast
    • B) Lysosome
    • C) Ribosome
    • D) Endoplasmic reticulum
  25. What provides mechanical support to animal cells?
    • A) Cell membrane
    • B) Cytoskeleton
    • C) Cell wall
    • D) Central vacuole
  26. Which part of the cell helps with communication and coordination?
    • A) Endoplasmic reticulum
    • B) Golgi apparatus
    • C) Cytoskeleton
    • D) Cell membrane
  27. What do peroxisomes do?
    • A) Break down fatty acids
    • B) Produce ATP
    • C) Store nutrients
    • D) Synthesize proteins
  28. Which part of the cell is missing in prokaryotic cells?
    • A) Ribosome
    • B) Cell membrane
    • C) Nucleus
    • D) Cell wall
  29. What is the role of nucleoplasm?
    • A) Support nuclear activities
    • B) Produce ATP
    • C) Store waste
    • D) Break down proteins
  30. What part of the plant cell contains chlorophyll?
    • A) Mitochondria
    • B) Chloroplast
    • C) Nucleus
    • D) Golgi apparatus
  31. What is the function of the cell wall in plants?
    • A) Provides structural support
    • B) Regulates substance movement
    • C) Conducts cellular respiration
    • D) Synthesizes proteins
  32. Which RNA type helps translate genetic information into proteins?
    • A) mRNA
    • B) tRNA
    • C) rRNA
    • D) sRNA
  33. What does the rough endoplasmic reticulum mainly do?
    • A) Modifies proteins
    • B) Synthesizes lipids
    • C) Stores calcium ions
    • D) Breaks down waste
  34. How do eukaryotic cells differ from prokaryotic cells in terms of genetic material?
    • A) Eukaryotic cells have a nucleus
    • B) Prokaryotic cells have a nucleus
    • C) Eukaryotic cells lack genetic material
    • D) Prokaryotic cells lack genetic material
  35. Which organelle is involved in steroid hormone synthesis?
    • A) Rough endoplasmic reticulum
    • B) Smooth endoplasmic reticulum
    • C) Golgi apparatus
    • D) Mitochondria
  36. What does the endoplasmic reticulum do?
    • A) Transports materials within the cell
    • B) Stores nutrients
    • C) Breaks down waste
    • D) Produces ATP
  37. What role do centrioles play in cells?
    • A) Facilitate cell division
    • B) Synthesize proteins
    • C) Break down waste
    • D) Produce energy
  38. Which organelle breaks down worn-out organelles?
    • A) Ribosome
    • B) Lysosome
    • C) Peroxisome
    • D) Mitochondria
  39. What is the function of the phospholipid bilayer?
    • A) Acts as a semi-permeable barrier
    • B) Stores genetic material
    • C) Synthesizes proteins
    • D) Produces ATP
  40. Which structure in a cell is involved in cellular waste management?
    • A) Lysosome
    • B) Golgi apparatus
    • C) Ribosome
    • D) Endoplasmic reticulum

 

Answer Key

  1. B) Mitochondria
  2. B) Controls what enters and exits the cell
  3. A) Golgi apparatus
  4. B) Nucleus
  5. B) Build proteins
  6. B) Smooth endoplasmic reticulum
  7. A) Break down waste
  8. B) Cell wall
  9. B) Tight junction
  10. B) Ribosomal RNA (rRNA)
  11. B) Mitochondria
  12. A) Supports cell shape
  13. B) Chloroplast
  14. B) Protein synthesis and modification
  15. C) Centriole
  16. A) Prokaryotic cells lack a nucleus
  17. A) Acts as a barrier
  18. A) Stores nutrients and waste
  19. B) Lysosome
  20. B) Mitochondria
  21. A) Acts as a barrier
  22. B) Smooth endoplasmic reticulum
  23. B) Stores genetic information
  24. A) Chloroplast
  25. B) Cytoskeleton
  26. D) Cell membrane
  27. A) Break down fatty acids
  28. C) Nucleus
  29. A) Support nuclear activities
  30. B) Chloroplast
  31. A) Provides structural support
  32. B) tRNA
  33. A) Modifies proteins
  34. A) Eukaryotic cells have a nucleus
  35. B) Smooth endoplasmic reticulum
  36. A) Transports materials within the cell
  37. A) Facilitate cell division
  38. B) Lysosome
  39. A) Acts as a semi-permeable barrier
  40. A) Lysosome