Write balanced chemical equation for the reaction that occurs when :

(i) blue coloured copper sulphate crystals are heated and

(ii) Sodium hydrogen carbonate is heated during cooking.

(a) Write the role of insulin in regulating blood sugar levels in human body. Mention the disease caused due to it.

(b) How is the timing and the amount of release of insulin in the blood regulated ?

With the help of a schematic flow chart, show the breakdown of glucose in a cell to provide energy —

(i) in the presence of oxygen

(ii) in lack of oxygen

Name the part of the human excretory system where nephrons are found. Write the structure and function of nephrons.