Aerobic Photoautotrophs
They evolved 3300 to 3500 million years ago. They were like present day cyanobacteria and could release O 2 into the atmosphere because they used water as the reagent. Thus, the whole reducing atmosphere changed to an oxidising atmosphere. Autotrophs are said to have arisen much later i..
They evolved 3300 to 3500 million years ago. They were like present day cyanobacteria and could release O 2 into the atmosphere because they used water as the reagent. Thus, the whole reducing atmosphere changed to an oxidising atmosphere. Autotrophs are said to have arisen much later i..Summary
In the modern system of classification, living organisms are grouped under five kingdoms, as proposed by Whittaker (1966). The Kingdom Monera includes bacteria and blue green algae, both of which possess prokaryotic cells. Bacteria are unicellular prokaryotes that have a wide dist..
Climatic Factors - Temperature
Temperature is one of the essential and changeable environmental factors. It penetrates into every region of the biosphere and profoundly influences all forms of life by increasing or decreasing some of the vital activities of the organism. It is frequently a limiting factor for the growth or distr..
Stages in Hydrosere
a) Plankton stage Germination of encysted spores in the newly formed water body forms the pioneer community, Spores could have reached the water body through wind or animals. Planktonic stage includes minute autotrophic diatoms, phytoflagellates, cyanobacteria etc. Population of phytopl..
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