Answer:
Phytohormones are
synthesised by plant cells, itself and individually. These are auxin, GA, ABA
ethylene and cytokinin. There is not a separate system of their translocation in
plants. So, their effects on plants are also inter mixed, e.g., many effects of
auxins GA shows the same function. Similarly, ethylene and ABA support each
other for many roles in plants.
Secondly, effects of
phytohormone in vitro and in vivo will also be different.
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