Class 8 Science Chapter 8 | Cell – Structure and Functions | Important Questions
Here are important questions from NCERT Class 8 Science Chapter 8 Cell Structure and Functions. Multiple choice questions from this chapter can be found here.
1. What is the structural unit of an organ?
Cell
2. Who was the first person to observe cells under a microscope?
Robert Hooke
3. The discovery of cell was made by Robert Hooke in ………………………….
1665
4. The egg of a hen is an example of a ………………………….
Cell
5. Which instrument is used to observe cells?
Microscope
6. Organisms made up of more than one cell are called …………………………………
Multicellular
7. Single-celled organisms are called ………………………………..
Unicellular
8. Give two examples of unicellular creatures
Amoeba and paramecium
9. A group of specialized cells form a ………………………..
Tissue
10. Tissues form …………………………..
Organs
11. The projections protruding out of an amoeba are called ……………………………..
Pseudopodia
12. Pseudopodia means ……………………………
False feet
13. How does the change in shape benefit amoeba?
Amoeba has no definite shape. Its shape changes due to the formation of pseudopodia. The pseudopodia enable it to move and capture prey.
14. Give an example of a human cell that changes shape?
The white blood cell
15. Red blood cells are …………………………… in shape.
Spherical
16. Muscle cells are …………………………. shaped.
Spindle
17. What provides shape to cells?
Cell membrane
18. Cell wall is present in …………………………. cells.
Plant
19. Bacterial cells have cell wall. Say true or false
True
20. The largest cell the ………………………………
egg of an ostrich
21. What is the size of an ostrich cell?
170 mm x 130 mm
22. What is the white material in an egg cell?
Albumin
23. The size of a cell is related to its ……………………………
Function
24. Which cells transfer messages and help to coordinate the working of different parts of the body?
Nerve cells
25. What is a tissue?
A tissue is a group of similar cells performing a specific function.
26. What are the basic components of a cell?
The basic components of a cell are cell membrane, cytoplasm and nucleus.
27. The cell membrane is also called ……………………………….. membrane.
Plasma
28. What separates cells from one another?
Cell membrane
29. Which solution is used to stain a plant cell?
Methylene blue
30. What is cytoplasm?
Cytoplasm is the jelly like substance between the nucleus and the cell membrane.
31. What is the nucleus?
The nucleus is the dense round body found in the centre of a cell.
32. Why do plant cells have a cell wall?
Plant cells need additional protection against variations in temperature, high wind speed and atmospheric moisture. Hence, plant cells have a cell wall outside the cell membrane.
33. The cell wall is ………………………… in an animal cell.
Absent
34. Which stain is used to stain animal cells?
Iodine or methylene blue
35. What are some components of cells?
Nucleus, mitochondria, golgi bodies and ribosomes
36. Nucleus is separated from the cytoplasm by a membrane called ……………………………..
Nuclear membrane
37. The cell membrane and the nuclear membrane are ……………………………
Porous
38. What is nucleolus?
It is the smaller spherical body inside the nucleus.
39. What are the thread-like structures in the nucleus?
They are chromatin.
40. What is the unit of inheritance in living organisms?
Gene
41. What is the control centre of the cell?
Nucleus
42. What is protoplasm?
The term protoplasm refers to the entire content of a cell.
43. What are prokaryotic cells?
These are cells having nuclear material without nuclear membrane.
44. Give some examples of prokaryotes?
Bacteria and blue green algae
45. What are eukaryotic cells?
Eukaryotic cells are those cells that have a well-organised nucleus with a nuclear membrane.
46. ………………………….. are the blank-looking structures in the cytoplasm?
Vacuole
47. Plant cells have ………………………….. vacuoles.
Large
48. What are plastids?
These are the small coloured bodies in the cytoplasm of plant cells.
49. The green coloured pigment in plastids are called ………………………………..
Chlorophyll
50. Green plastids containing chlorophyll are called …………………………….
Chloroplasts
