Class 8: CELLS STRUCTURE AND FUNCTIONS

Practice Paper

Subject Biology

Class VIII                  Ch- CELLS STRUCTURE AND FUNCTIONS                               

1. Mention the layer outside the plasma membrane of a plant cell.
2. Name the outermost layer of an animal cell.
3. Name the cells having branching structure.
4. Why cells could not be observed before seventeenth century?
5. What is the basic structural and functional unit of all living organisms?
6. Which organism has the smallest cell?
7. Which is the largest cell visible by unaided eye?
8. Name the four elements, which form major part of protoplasm.
9. Give two examples of unicellular organisms.
10. Name the jelly like substance present between the nucleus and the cell membrane.
11. Name the living substance of the cell.
12. Which organelle is called control centre of the activities of the cell?
13. Give two examples of prokaryotes.
14. Name the largest organelle present in a cell.
15. Name the green plastids present in cell. 
16. Write a brief note on mitochondria.
17. Why do we stain the small components of section, before seeing under the microscope? Name a stain.
18. Name any four cell organelles found in the cell cytoplasm?
19. Why is the cell called basic unit of living organism?
20. What is the function of cell membrane?
21. What is the function of nerve cell?
22. What are the basic components of cell?
23. Why plant cell have cell wall?
24.  Describe the variations in shape and size of cells.
25. Explain why chloroplasts are found only in plant cells?
26. Write the functions of the following :
    a) Mitochondria b) Chromosomes c) Plastids.
27. Write three differences between prokaryotic and eukaryotic cells.
28. Where are chromosomes found in a cell? State their function.
29. Draw the diagram of plant and animal cell.
30. Make a sketch of the human nerve cell. What function do nerve cells perform
31. Write short notes on the following: a)Cytoplasm b) Nucleus
32. Differentiate between plant and animal cell.