How does chemical coordination occur in plants? Explain with the help of three examples.

(N/A) In plants,chemical coordination occurs through various phytohormones (plant hormones).
$(i)$ Auxins: These are secreted by growing tissues and promote the growth of plants.
$(ii)$ Gibberellins: These hormones are responsible for stem elongation,seed germination,and flowering.
$(iii)$ Cytokinins: These are present in areas of actively dividing cells,such as fruits and seeds,and they promote cell division.
$(iv)$ Abscisic acid: This hormone inhibits growth and helps the plant respond to environmental stress.
(Any three of the above examples explain chemical coordination in plants.)