Stagnated water increases the chances of malarial attack manifold. Give reason.
Give reasons why :
(a) Waste water should not be allowed to stagnate in puddles.
(b) Waste water from a factory should not be allowed to mix with drinking water.
(c) Rubber, plastic should not be burnt.
(d) The quantity and types of garbage generated have increased.
Assertion (A): Grains should be dried properly before storing.
Reason (R): Moisture content increases the chances of spoilage due to micro-organisms.
We should not let water stagnate near our surroundings. Give reason why?