How many types of natural auxins are there?

plantgrowth
cbse

#1

Natural auxins are of two types :
(i) free and (ii)bound auxins, (a) The auxins which can easily be extracted are called free auxins whereas auxins which are hard to extract and need the use of organic solvents are termed as bound auxins, (b) The free form of auxins is active while the bound ; auxin is inactive in growth.