Diversity of Chordates

The chordates exhibit an astonishing diversity in form, physiology and habits. The number of chordate species is limited. About 49,000 species are on record which are only half of the living species of molluscs and less than one tenth of arthropods. Despite their modest number of species, the chordates make remarkable contribution to the bio-mass … Read more Diversity of Chordates

Transpiration Pull Theory

This is also called as cohesion-tension theory put forward by Dixon and Joly (1894) and supported by Renner, Curtis and Clark. This theory is based on a number of features. Cohesion and Adhesion Mutual attraction between water molecules is called cohesion and this force may have a value as high as 350 atmospheres. The wall … Read more Transpiration Pull Theory

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