What happens when
(a) Cooking medium is made to flow down a drain.
(b) Insecticides, motor oil, paints are poured down the drain.
(c) Tea leaves, cotton swabs and old soft toys are thrown into the drain.
a. If cooking medium is made to flow down a drain it may clog the pores of soil or may block the pipe lines.
b. If insecticides, motor oil or paints are poured down the drain it may kill the microbes that are used to purify waste water flowing through drains.
c. Tea leaves, cotton swabs, old soft toys if thrown into drain may clog the pipe lines and water cannot flow through drains it may come out into roads or public places causing havoc.