Describe fresh water and marine resources of India and discuss their conservation practices. 

Pond and lake as Ecosystems:

Pond and lake are fresh water ecosystem in which, like other ecosystems, there are two main components:

(A) Abiotic component.

Abiotic component of pond consists of water, dissolved minerals, oxygen and carbon dioxide. Solar radiations are the main sources of energy.

(B) Biotic component:

It includes the following:

(i) Producers

(ii) Consumers

(iii) Decomposers and transformers

On the basis of water depth and types of vegetation and animals there may be three zones in a lake or pond: littoral, limnetic and profundal. The littoral zone is the shallow water region which is usually occupied by rooted plants. The limnetic zone ranges from the shallow to the depth of effective light penetration and associated organisms are small crustaceans, rotifers,, insects, and their larvae and algae. The ____ __________ _____ ____ __________ ___ _______ _______ _______ ______ _____ __________.
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