Life on the Earth

A large area with distinct groups of plants and animals.

Ecological balance is a state of dynamic equilibrium within a community of organisms in a habitat or ecosystem.

1. Each group of organisms occupies a feeding level called a trophic level. The different trophic levels may be represented in the form of a pyramid called ecological pyramid.

2. Man is at the top of the ecological pyramid. The pyramid has a large base.
3. It represents primary producers. From base to the top, the numbers go on deceasing at each trophic level.
4. All green plants and other producers occupy the first trophic level. Herbivores which feed on plants occupy the second trophic level. Carnivores that eat herbivores are at the third trophic level.
5. At each level, the flow of energy is reduced; because only a fraction of energy is transferred from lower to higher level.