Construct an aquatic chain showing four trophic levels.

Observe the food chain:
$\mathrm{Plant} (1000 \mathrm{kJ})\to \mathrm{Goat}\to \mathrm{Lion}$

(a) If autotrophs occupying the first trophic level are called producers, what are herbivores called as?
(b) How much energy does the lion get in the above food chain?

“The maximum concentration of harmful chemicals accumulates in human beings"? State the phenomenon involved and justify this statement.

Define

Anaerobic degradation.

List two environment-friendly practices or habits which need to be followed by every member of a family/community. Explain how these practices will support the “Save the Environment" mission?