20. Father Of Botany - Sage Parasara
In the year 1665 AD, Robert Hook, a botanist with the help of his microscope, explained to the world about the Plant cell and its structure. One thousand and six hundred years ago prior to that date, sage Parasara in 1st century AD had clearly explained the structure of a Plant cell in the Sanskrit work "Vriksha Ayurveda".
Parasara had even explained the phenomenon of the Photosynthesis (process of self nourishment in the plants) in the fourth chapter (Vriksha sharira Dharma sastram) of the same book.