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Q. Define biogeographic realm?
Biogeographic regions are large areas that contain characteristic assemblages of animals and plants, d elineated on account of natural barriers such as oceans, mountains and deserts. A biogeographic region is generally characterised by high levels of species endemism.
Boundaries between biogeographic regions are called "biogeographic lines".
Examples are:
· Wallace's line between Southeast Asia and Australia (between Sundaland and Wallaceae), and · Kangar-Pattini line between India and Myanmar.
The marine environment is three-dimensional with a distinct vertical zonation, each having its distinct associated species. Accordingly in a particular oceanic region, intertidal areas, the upper layers of the open ocean and the deep sea have very different assemblage by species.
Protoplasmic Streaming and Tubular Peristaltic Flow Model The first of the above two models involves the well known phenomenon of cytoplasmic streaming in giant algal cells. C
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Types of Axons Axons are of two types Myelinated and Non-myelinated In the case of myelinated axons the neurilemma is ensheathed by another cover
Which type of reproductive structure has a better chance of survival if there was a sudden temperature change in its environment?
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