22. What are the main natural
plant hormones and what are
their respective effects?

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The main natural plant and
their respective functions the
following:

Auxins (the known natural auxin is
, indoleacetic acid): their function
to promote plant growth, and
cellular differentiation. Gibberellins:
action similar to auxins (
and distension), stimulate flowering
fruit formation and activate
germination. Cytokinins: increase
cellular rate and together with
help growth and tissue
, slow the plant aging.
(ethene): a gas released
plants that participates in growth
process and has role in fruit
ripening in leaf abscission.