Which of the following are the essential sources for releasing in the atmosphere?

$I.$ Burning of wood

$II.$ Volcanic activity

$III.$ Combustion of organic matter

$IV.$ Fossil fuels

Choose the correct option

Major conduit of energy in land and aquatic ecosystem is transferred through ______ and ______ respectively.

Assertion : Biotic community has higher position than population in ecological hierarchy.
Reason : Population of similar individuals remains isolated in the community.

The trophic level of lion in a forest ecosystem is

A plant being eaten by a herbivorous which in turn is eaten by a carnivorous makes