P-2 Environmental management — Science STD 10 — Question

(i) The ultimate source of energy is any ecosystem is the sun.
(ii) Part of the energy received by an ecosystem from the Sun is stored in food molecules by plants.
(iii) When this energy is transferred from one trophic level to another trophic level, some part of energy is released in the form of heat and some part is utilized for metabolism.
(iv) No energy in the ecosystem goes back to the Sun.
(v) Thus, the flow of energy in the ecosystem is unidirectional.