Botany

Botany , also called plant science , is the branch of natural science and biology that studies the growth , reproduction and evolution of plants over the last 3.5 billion years of life on earth . As with all areas of biology and medicine , plants can be studied at range of levels from their biochemistry , molecular biology , cell biology and genetics to their ecology , pathology , anatomy , morphology and taxonomy . A botanist or plant scientist is a scientist who specialises in this field. Plants can be defined in multiple ways including approximately 410,000 species of land plants , and some 391,000 species of vascular plants , of which approximately 369,000 are flowering plants and approximately 20,000 bryophytes .

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