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Control and coordination
What is control and coordination ¿
Plant hormones
Plant movement
Longest cell of the human body originates from brain and this cell is
called as neurons or nerve cells
...

Stimuli or stimulus changes in the environment to which the
organism response and react
...
They also have endocrine system that includes glands and
organs involving hormones
...

Coordination working of various organs and they coordinate with one
another in systematic Manner in order to provide proper reaction to
the stimulus
...



• Growth and movement in plants are controlled by both internal and
external factors
...



Plant hormones
• As plants lack nervous system so the control and
coordination functions are performed by the chemical
substances known as plant hormones or phytohormones
...

Plant growth is mainly achieved by
• Cell division involving two processes mitosis and
meiosis
...
whereas meiosis is essential for the
formation of reproductive cells in sexual reproduction
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• Cell di erentiation is a process in plants when the plant
cells became specialized to perform speci c functions
within the plant
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Phytohormones are of four di erent types _|
1
...
Gibberellin
3
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Abscisic acid
• For balanced and control development of plants a
group of substances called growth regulators are
essential as they include growth Accelerators and
growth inhibitors
...
Fruit growth is due to auxins hormone present in
plants
...
They helps in breaking seeds dormancy (state of
seeds when they pause the ability to grow)as well as in buds
and do help in promoting fruit growth
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Cytokinin promotes cell division that includes

mitosis and meiosis
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They release apical dominance
(Which is when the top bud of plants suppresses the
growth of side buds)
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2
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It
supports closing of stomata resulting in wilting,falling
of leaves, oral parts ,fruits etc

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