How can we quantitatively compare the growth of living system?
Quantitative comparisons between the growth of living system can be done in two ways :
(i) By measuring and comparing the total
growth per unit time that is the absolute growth rate.
(ii) By comparing the growth of the given system per unit time expressed on a common basis that is the the relative growth rate.
Auxin was isolated by F.W. Went from tips of coleoptiles of oat seedling.
Auxins are of two types :
(1) Natural auxins : These are naturally occuring auxins, isolated from plants and are regarded as phytohormones e.g. IAA. NAA etc.
(2) Synthetic auxins : These are synthesized by artificially e.g. IBA 2,4-D etc.