Match the following
A-4, B-3, C-1, D-2
Which of the following is usually not a water pollutant?
(a) sewage
(b) fertiliser
(c) fly ash
(d) pesticide
Give Scientific reasons.
1. Plants in an ecosystem are called producers.
2. The flow of energy in an ecosystem is unidirectional.
3. The flow of nutrients in an ecosystem is cyclic.
4. Decomposers are crucial biotic factors in any ecosystem.