Question

can some one tell science important questions for class 8

Answer 1

1.  What is the difference between an animal cell and a plant cell?2.  Why are chloroplast found only in plant cells?3.  Cells are the basic structural and functional unit of life. Explain.4.  What is the difference between eukaryotes and prokaryotes?5.  Explain the process of photosynthesis.6.  Explain cytoplasm in brief.7.  Write a note on nucleus of a cell.8.  What is the function of Nerve Cells?9.  What is the function of Nucleus?10.  Draw a neat diagram of a Nerve Cell.orrrrrr i tink 
1.   What are insulators of electricity?2.   Name some substances other than water which conducts electricity?3.   Which effect of current causes the bulb to glow?



4.   What is magnetic effect of electric current?5.   What are electrodes?6.   Explain mechanism of glowing bulb?7.   What do you mean by magnetic effect of electricity?8.   Prepare a tester to test conduction based on magnetic effect of the electricity.9.   Name some substances which make the liquids good conductor of electricity.10.   Give two examples of poor conductors of electricity.



answer 9- 
The thing that makes liquids good conductors is the presence of ions or an ability of electrons to be passed from one atom to another. Some liquids are good conductors, and some are not. Water is a pretty poor conductor when it is pure. Add a little salt, and it becomes pretty good because of the salt ions.



answer 10 -
it was easy one 
Poor conductors of electricity include; plastic, rubber, wood, glass, ceramics, air and other gases.

Answer 2

chap 4
chap 9
chap 11, 12, 13 are important chaps