Question

In plants nervous sustem is absent . How fo plants control and coordinatevdifferent activities

Answer 1

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Its takes place in them with the help of hormones Known as PHYTOHORMONES..

Kind of Plant Hormones are:

1.Auxin

2.Gibberelins

3.Cytokinin

4.Absisic Acid

Answer 2

Plants have a unique mechanism of controlling and coordinating its various physiological and biological processes. Plants respond to light, touch, gravitational force and other stimuli.

The plants do not have a nervous system but they can sense things in the presence of stimuli such as light, touch, water etc. and respond to them by the action of hormones. Thus, the plants coordinate their behavior against environmental behavior by using organic chemicals called hormones. This is called chemical coordination. The hormones in plants coordinate their behavior by affecting the growth of a part of the plant resulting in the movement of that plant part in response to a stimulus. The control and coordination in animals takes place by both nervous system and hormones.
(b)
(i) Light – Phototropism.
(ii) Gravity – Geotropism.
(iii) Chemical – Chemotropism.
(iv) Water – Hydrotropism.
(v) Touch – Thigmotropism.
(c) The movement of a plant part in response to water is called hydrotropism. Example: The roots of a plant always go towards water, this is positive hydrotropism.




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