Question

function and the secretion of plant hormone

Answer 1

Auxins promote stem elongation, inhibit growth of lateral buds (maintains apical dominance). They are produced in the stem, buds, and root tips. ... Auxin is a plant hormone produced in the stem tip that promotes cell elongation.

Answer 2

Functions of plant hormones:

${ \red{ \bf{ Auxins: }}}$

${ \green{ \bf{ Site\: of \: Synthesis:}}}$

Synthesized primarily in shoot apical meristems and young leaves.

${ \green{ \bf{ Functions: }}}$

Promote cell elongation.

Suppress the growth of lateral buds.

Delay fall of leaves.

Induce formation of parthenocarpic fruits.

${ \red{ \bf{Gibberellins: }}}$

${ \green{ \bf{ Site\: of \: Synthesis:}}}$

Synthesized primarily in the meristems of apical buds and roots.

${ \green{ \bf{ Functions: }}}$

Help in stem-elongation.

Break dormancy of seeds and buds.

Delay senescence.

Induce parthenocarpy.

${ \red{ \bf{ Cytokinins: }}}$

${ \green{ \bf{ Site\: of \: Synthesis:}}}$

Synthesized primarily in roots and transported to other organs.

${ \green{ \bf{ Functions: }}}$

Stimulate cell-division and cell enlargement.

Prevent ageing of plant parts.

Inhibit apical dominance.

${ \red{ \bf{ Ethylene:}}}$

${ \green{ \bf{ Site\: of \: Synthesis:}}}$

Synthesized in senescent leaves and flowers, germinating seeds and ripening fruits.

${ \green{ \bf{Functions: }}}$

Induces fruit ripening.

Promotes senescence.

${ \red{ \bf{ Abscisic \: acid: }}}$

${ \green{ \bf{ Site\: of \: Synthesis:}}}$

Synthesized in green fruits and seeds at the beginning of the wintering period.

${ \green{ \bf{ Functions: }}}$

Induces dormancy of buds and seeds.

Inhibits seed-germination and development.

Stimulates closing of stomata.