Name the two fundamental trophic levels and describe the general make up of each.

Explanation

The two fundamental trophic levels include the follwing :
1. Producers (Autotrophic organism). The green plants are the producers in any ecosystem. They also include photosynthetic bacteria. The producers use radiant energy of the sun during photosynthesis whereby carbon dioxide is assimilated and the light energy is converted into chemical energy. This energy is locked up into the energy rich carbon compounds i.e. carbohydrates. The oxygen that is evolved as a by-product in photosynthesis is used in respiration by all living organisms.
2. Consumers (Heterotrophic organisms. They are the living members of the ecosystem which consume the food synthesized by the producers. All living animals are thought to be consumers. The consumers may be of the following types :
(i) Primary consumers (also called first order consumers) which are purely herbivorous and depend upon green plants i.e. on producers for their food e.g., Cow, Goat, Rabbit, Deer, Grasshopper and other insects.
(ii) Secondary consumers (also called second order consumers) which are carnivorous animals and eat flesh of herbivorous animals e.g., Tiger, Lion, Dog, Cat, Frog, etc.
(iii) Tertiary consumers are the carnivorous animals that eat other carnivores e.g. Snake eats a frog, birds eat fishes.
(iv) Top consumers are carnivores of an ecosystem which are not killed and eaten by other animals e.g. Lions, vultures, etc.