1 ) Name the excretory unit of kidney?
Ans.) The excretory unit of kindly is nephorn.
2 ) where DNA is found inside the cell?
Ans. DNA is found in the nucleus of a cell .
3. )Give on example each of thermal decomposition and electrolytic decomposition?
Ans.) Thermal decomposition : when a decomposition reaction is carried out by heating, its called thermal decomposition.
example: CaCO3(S) → CaO + CO2
Electrolytic decomposition : When decomposition is carried out with the help of passing electric current.
example: NaCl → Na+ + Cl-
4.) In the electrolytic refining of metal ,M ,name the cathode and anode?
Ans.) In the electrolytic refining of metal M
Cathode - Pure metal
Anode - Impure metal
5.) What is the nature of image formed on the retina?
Ans.) Real, inverted and equal in size.