Aartee Mishra is teaching live on Unacademy Plus
Environment Book Summary Presented B Aartee Mishra
Aquatic Biomes . Freshwater Lakes and Ponds Streams and Rivers - Marshes and Swamps Marine - Oceans Coastal wetlands
Desert . Region Continental interiors with very low and sporadic rainfall with The flora is drought resistance vegetation such as cactus, euphorbias, Aquatic Zones low humidity. The days are very hot but nights are cold. sagebrush. Fauna: Reptiles, Mammals and birds. Aquatic systems are not called biomes, however they are divided into distinct life zones, with regions of relatively distinct plant and animal life. The major differences are due to salinity, levels of dissolved nutrients; water temperature, depth of sunlight penetration Fresh water ecosystem are classified as lotic (moving water) or lentic (still or stagnant water). Lotic water system includes freshwater streams, springs, rivulets, creeks, brooks, and rivers. Lentic water bodies include pools, ponds, some swamps, bogs and lakes. They vary considerably in physical, chemical and biological characteristics.
AQUATIC ECOSYSTEMS They can be... MARINE FRESHWATER They can be... Coral reefs Flowing Water Rivers and streams Standing Water lakes and ponds Shoreline Wetlands Open ocean
Marine Ecosystem Nearly three quarter of earth's surface is covered by ocean with an average depth of 3,750 m and with salinity 35 ppt, (parts per thousand), about 90 per cent of which is sodium chloride. Estuaries -Coastal bays, river mouths and tidal marshes form the estuaries. In estuaries, fresh water from rivers meet ocean water and the two are mixed by action of tides. Estuaries are highly productive as compared to the adjacent river or sea Biosphere Biosphere is a part of the earth where life can exist. Biosphere represents a highly integrated and interacting zone comprising of atmosphere (air), hydrosphere (water) and lithosphere (land). Life in the biosphere is abundant between 200 metres (660 feet) below the surface of the ocean and about 6,000 me"res (20,000 feet) above sea level.
Estuaries Where Rivers Meet the Sea
Biosphere is absent at extremes of the North and South poles, the highest mountains and the deepest oceans, since existing hostile conditions there do not support life. Spores of fungi and bacteria do occur at great height beyond 8,000 metres, but they are not metabolically active, and hence represent only dormant life. The energy required for the life within the biosphere comes from the sun. The nutrients necessary for living organisms come from air, water and soil. Biosphere Hydrosphere Biosphere
The same chemicals are recycled over and over again for life to continue. Living organisms are not uniformly distributed throughout the biosphere. .Only a few organisms live in the polar regions, while the tropical rain forests have an exceedingly rich diversity of plants and animals.