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You are here: Home / Class 10 / Control and coordination / Plant movement

Plant movement

Last Updated on March 20, 2019 By Mrs Shilpi Nagpal 5 Comments

Question 1 Name two types of movements shown by plants?

Question 2 Define the term phototropism?

Question 3 What is positive stimulus?

Question 4 What is negative stimulus?

Question 5 Define the term geotropism?

Question 6 Define the term chemotropism?

Question 7 Define the term hydrotropism?

Coordination in plants
Plants do not have nervous system,muscles and sense organs but still they respond to various environmental stimuli such as light,water,gravity,touch,chemicals etc.

Plants show 2 types of movement in response to various stimuli:
1)Movement independent of growth
2)Movement dependent on growth

Plants coordinate their response against environmental stimuli by using hormones.
Hormones coordinate in 2 ways:
1)Effecting the growth of plant and as a result part of plant show movement.
2)Affecting the shape of plant cell by changing amount of water in them(shrinking or swelling)

The plants use electrical chemical means to convey the information from cell to cell.

Plant Movement
Tropic movement or tropism
Directional movement of specific part of plant in response to external stimuli is called tropism.
These movements are very slow.The movement of plant part can be either towards or away from stimulus.
If the movement of plant is towards stimulus,it is called positive stimulus.

If the movement of plant is away from stimulus,it is called negative stimulus.

1)Phototropism:It is the directional movement of plant part in response to light stimulus.
If plant part move towards light it is called as positive phototropism.
For Ex:Stem or shoot
If plant part move away from light it is called as negative phototropism.
For Ex:Roots

2)Geotropism:It is the response to gravity.
If the plant part moves in the direction of gravity it is called positive geotropism
For Ex:Roots grow downwards.
If the plant part moves against the direction of gravity it is called negative geotropism.
For Ex:Stem grows upwards

3)Chemotropism:Response to chemical stimuli.

If Plant part move towards chemical stimuli it is positive chemotropism
If plant part move away from chemical stimuli it is negative chemotropism.

4)Hydrotropism:Response to water

Filed Under: Class 10, Control and coordination Tagged With: chemotropism, geotropism, hydrotropism, negative chemotropism, negative geotropism, negative phototropism, negative stimulus, phototropism, plant movement, positive chemotropism, positive geotropism, positive phototropism, positive stimulus, stimulus, tropic movement, tropism

About Mrs Shilpi Nagpal

Author of this website, Mrs Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed (I. P. University) and has many years of experience in teaching. She has started this educational website with the mindset of spreading Free Education to everyone.

Reader Interactions

Comments

  1. Sahil says

    May 5, 2018 at 4:58 pm

    Really inspired by this thanks a lot

    Reply
  2. Komal says

    August 1, 2018 at 4:38 pm

    This is very useful , thanks a lot

    Reply
  3. Jake says

    August 12, 2018 at 1:10 am

    Great knowledge of Plants

    Reply
  4. Raju says

    July 8, 2019 at 8:03 pm

    Really it is very useful for me .
    Thanks a lot.
    Please I prays you provide more notes …

    Reply
  5. Yuvika says

    May 7, 2020 at 12:07 pm

    It helped me revise this topic in a more understandable manner. I appreciate your work.
    Thanks.

    Reply

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