Some statements are given below each with one or two blanks. Select option that correctly fills up blanks.

(i)  High concentration of DDT disturbs_____ in birds, which causes______.
(ii)  _______ burns more efficiently as compared to petrol and diesel.
(iii)  ______ is natural ageing of a lake which occurs due to accumulation of_______.
(iv)  ______ reduces number of organisms which are sensitive to high temperature.
(v)  Irreparable computers and or electronic goods are known as _______.