Co-ordination in Plants

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      🌳    Co-ordination in Plants   🌳

Plants do not have systems like the nervous system or muscular system of animals . 
Then , how do plants bring about movements ? 
In plants , movements are mainly in the form of responses given to the stimuli .


Movement or growth of any part of the plant in response to an external stimulus is called 'tropism' or 'tropic movements' .

The shoot system of any plant responds to the light stimulus that is it grows towards the source of the light .
The movements shown by plants towards the source of the light is called 'Phototropic Movement' .

The root system of plants responds to stimuli like gravitation and water . 
These responses are called 'gravitropic movements' and 'hydrotropic movement' resectively .

Movement shown by plants in response to specific chemicals is called 'chemotropic movements' . 
For example , the growth of the pollen tube towards the ovule .

All the above - mentioned movements of plants are related with growth ; hence all such movements are collectively called 'growth relevents movements' .


On careful observation it is seen that in plants like touch-me-not (Mimosa) , movements also occurs at the places other than where it has been touched . 
Hence , we can infer that the information about the touch must have been relayed within the plants from one place to another . 


Plants use electro - chemical impulses for transfer of information from one place to another .
Plants cells change their shape by increasing or decreasing their water content and thereby bring about the movements of plants .

Some specific movements of the plants do not lead to plant's growth .
Such movements are called 'growth - irrelevant movements' . 
As a response to changes in the surrounding , plant hormones bring about  various movements in plants .  

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