Environment

• Environment is referred to as the sum total of all the physical and biotic conditions which influence the organism in terms of survival and reproduction.
• Different seasons results due to

(i) Rotation of earth around the sun.

(ii) Tilting of the earth on its axis.

• The major biomes of the world include desert, grassland, rainforest and tundra.
• Formation of different biomes is due to:-

(i) Annual variations in intensity and duration of temperature.

(ii) Annual variations in precipitation.

• The above annual variations together with annual variation in precipitation (precipitation include both rain and snow) thus form major biomes.
• The biomes may be desert, rainforest and tundra.
• Regional and local variations within each biome lead to the formation of different habitats.

Components of Ecosystem:-