Download Std 8-Holiday worksheet-Science-2017-18 (1)

PON VIDYASHARM
SCIENCE HOLIDAY WORKSHEET
VIII – STD
Topic: Cell: Structure and Function
I.
ANSWER IN ONE WORD:
1. Who discovered the following and when?
a. Cell b. Nucleus c. protoplasm d. Microscope e. Compound Microscope
f. Electron Microscope
2. Give 5 examples of single celled organisms.
3. Unit to measure the size of a cell:
4. Name the following: 1. The largest cell, 2. The longest cell 3. The smallest cell
5. What is the main function of vacuoles in plant and animal cell?
6. The constituent of cell wall and cell membrane:
7. Expand DNA and RNA.
8. Name the following:
a. Power house of the cell
b. suicidal bags of cell
c. protein factories of cell
d. Transporting structures
9. Another name of Golgi bodies in plants:
10. Type of plastids present in ripe banana and orange:
11. Name the kitchen of the plant and the pigment present in it.
12. Name the structures that help in cell division:
II.
ANSWER THE FOLLOWING:
1.
2.
3.
4.
5.
6.
7.
8.
9.
Why do plants have cell walls and animals don’t?
What are the functions of cell wall?
Plant cells possess large sized vacuoles. Give reason.
Why is cell called structural and functional unit of life?
Distinguish between prokaryotic and eukaryotic cell.
Distinguish between unicellular and multi cellular organisms.
Distinguish between cell wall and plasma membrane.
Draw and explain the structure which is called “ Brain of the cell”
Draw neat labeled diagrams of the following:
a. Plant cell
b. Animal cell c. Nerve cell
10. Write the functions of the following cell organelles:
a. Endoplasmic reticulum
b. Golgi bodies
c. Mitochondria.
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