lection
River Pond and oceans
ecosystem
Answers
★A pond or lake ecosystem includes biotic (living) plants, animals and micro-organisms, as well as abiotic (nonliving) physical and chemical interactions. Pond and lake ecosystems are a prime example of lentic ecosystems. Lentic refers to stationary or relatively still water, from the Latin lentus, which means sluggish.
Answer:
Water is an essential medium for all living processes of biota. Approximately, 71 % of the earth’s surface is covered by ocean. The aquatic ecosystem constitutes the marine environments of the seas called ‘marine ecosystem’ and the fresh water systems in lakes, rivers, streams, ponds and wetlands called ‘fresh water ecosystem’. These ecosystems provide human beings with a wealth of natural resources. Freshwater ecosystems are further of standing type (lentic) like ponds and lakes or free-flowing type (lotic), like rivers and streams. Freshwater ecosystems are influenced by local climate, soil, resident communicates and also on surrounding terrestrial ecosystems.
(a) Pond ecosystem: It is a small freshwater aquatic ecosystem where water is stagnant. Ponds may be seasonal in nature i.e. receiving enough water during rainy season. Ponds are usually shallow water bodies which playa very important role in the villages where most of the activities center around ponds. They contain several types of algae, aquatic plants, insects, fishes and birds. The ponds are, however, very often exposed to tremendous anthropogenic (human-generated) pressures. They are used for washing clothes, bathing, swimming, cattle bathing and drinking etc. and therefore get polluted.
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