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

Plant Hormone

Last Updated on March 20, 2019 By Mrs Shilpi Nagpal 8 Comments

Question 1 What are phytohormones?

Question 2 Name the three phases of plant growth?

Question 3 What is the function of growth regulators.Give example?

Question 4 What are growth inhibitors?Give example?

Question 5 What are auxins?

Question 6 What are Gibberellins?

Question 7 What is the function of cytokinins?

Question 8 Name the  stress hormone in plants that function during night?

Question 9 Name plant hormone which are growth promoters?

Question 10  Which plant hormone help in ripening of fruits?

Question 11 How does control and coordination take place in plants?

Plant Hormone(Phytohormones)
Phytohormones are naturally occurring organic chemical substances present in plant which bring about control and coordination of various activities in them.

These phytohormones are synthesised in minute quantities in one part of plant body and simply diffuse to other parts where they influence specific physiological process.

Growth Regulators
Growth in plants mainly occur by the activity of meristematic cells.The new cells are continually Produced by cell division in a meristem.

Meristematic cells are present at the apex of every root and shoot.
Three phases of cell growth are:
1)Cell division
2)Cell enlargement
3)Cell maturation
They are controlled by phytohormones.

5 Major type of phytohormones which are involved in control and coordination are:
Auxins
Gibberellins
cytokinins
Abscisic acid
Ethene

Growth promoters:These stimulate the plant growth .
For Ex:Auxins,Gibberellins,cytokinins,ethene

Growth Inhibitors:These retard the plant growth.

Auxins:When a plant detect light,auxin hormone is synthesised at the shoot tip,help the cells to grow longer.
When light is coming from one side of plant,auxin diffuse towards shady side of shoot.This concentration of auxin stimulate the cells to grow longer on the side of shoot which is away from light.Thus plant appear to bend towards light.

It promotes stem,fruit,growth,regulates tropism.

Gibberellins:They help in growth in stem and fruits,cell enlargement,cell differentiation.

Cytokinins:They promote cell division,help in breaking dormancy of seeds,delay the ageing of leaves,promote opening of stomata,promote fruit growth.

Ethene:It promote growth and ripening of fruit,help in breaking the dormancy in bud.

Abscisic acid:It promotes dormancy in seeds and buds and thus inhibits growth,promote closing of stomata,falling of leaves.

Filed Under: Class 10, Control and coordination Tagged With: abscisic acid, auxins, cell promoters, cytokinins, ethene, gibberellins, growth inhibitors, growth regulators, phytohormones, plant hormone

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. RICHA says

    August 15, 2017 at 6:44 pm

    NOT BAD
    AVERAGE

    Reply
  2. Varshita says

    August 16, 2018 at 5:37 am

    Explained very nycly

    Reply
  3. Rajvinder says

    August 29, 2018 at 1:56 pm

    Nice and Concise notes

    Reply
  4. Piyush says

    August 29, 2018 at 8:51 pm

    Nice notes and easy to understand

    Reply
  5. Abrar Ahmed says

    September 29, 2018 at 12:27 am

    Great Notes.Easy to understand.Was very helpful. Thanks.

    Reply
  6. Ayushmaan says

    February 14, 2019 at 8:39 pm

    Thanks

    Reply
  7. Aman says

    January 9, 2020 at 7:49 am

    Its really helpful

    Reply
  8. Hema says

    May 15, 2020 at 5:18 pm

    Really good … got more points thanks for uploading this.what a worth.

    Reply

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