(III) Truel False Questions:-
a) Using good quality seed is the only criterion to get high yield.
b) Viruses can only multiply in a living cell.
c) Copper displaces Zinc from Zinc sulphate solution
d) Muscular forces and frictional force are the examples of Non-contact force.
(IV) Define the following keywords:-
Answers
Answer:
Explanation:
a) False because even tough if we sow good quality seeds without enough nutrients they can't grow. Therefore good quality seed is not the only condition required for high yield
b)True because even if virus is outside our body it will not affect us. It just floats around lifeless because it does not have the machinery which controls the life processes but once it enters the cell it gets the ability to reproduce and starts multiplying.
c)False because in a displacement reaction only a highly reactive metal can replace a less reactive one. As copper is less reactive than zinc it can never replace zinc.
d)False because without touching you can never move an object by yourself without touching it. So it is a contact force. there is friction if you do not have contact with it. Even if you are in air you will experience friction as you come in contact with friction