Ecology is the scientific study of the relationships between organisms and their natural environment. Key concepts like trophic levels and biomes were refined in the 1920s and 1930s. A biome is a large region defined by its climate and combination of plants and animals, with the Earth divided into land and water biomes.

1. The science of ecology
Study of ‘Earth Household”
More precisely it is the scientific study of the
relationships between the members of the
Earth households and their natural
environment.

2. Basic Ecological concepts
The first key
concepts were
refined in 1920s
and 1930s.

3. Trophic Levels
Trophic level is
used to describe
the position an
organism
occupies in food
chain.

4. What is biome?
A biome is a large region that has a distinct climate and combination of
plants and animals. The earth itself can be considered to be one large
biome. The earth is divided into two major biome types. They are the land
and water biomes.