Describe the five-principal group of organisms?
The five-principal group of organisms is prokaryotes, protists, fungi, plants, and animals
How arranging groups of organisms arranged in an evolutionary tree?
Evolutionary tree:
Since 1960 a trend has emerged, arranging groups of organisms in an evolutionary tree, if a group includes all the descendants of the same ancestral form it is called monophyletic. Other groups are called Polyphyletic.
Relate the importance of Biodiversity with natural ecosystems through examples?
Biodiversity:
Biodiversity is a measure of the variety of organisms present in different ecosystems.
The term “biodiversity” has been derived from 'bio' and ‘diversity’. Formerly it was called “natural diversity”. “Diversity” means variety within a species and among species.
Importance of biodiversity and natural ecosystem:
Plants and animals (flora and fauna) diversity depends on the climate, altitude, soil, and the presence of other species. Biodiversity is not distributed evenly on Earth. It is richer in the tropics while there are fewer species in the polar regions. In the year 2006 large number of the Earth's species were classified as endangered or threatened species.
Examples: