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Plant Growth and Development

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
Differentiate between growth hormones and inhibitor hormones.

Growth hormones :

1. They bring growth.

2. They stimulate cell division.

3. They bring opening of stomata.

4. They check abscission of leaves except ethylene.

5. They break seed dormancy.

6. They induce formation of fruits and flowers in all types of plants.

7. Gibberellins overcome vernalization.

Inhibitor hormones :

1. They retard growth.

2. They inhibit cell division.

3. They bring closing of stomata.

4. They bring abscission of leaves.

5. They induce seed dormancy.

6. They generally do not induce fruit and flower formation.

7. They have no impact.



Who coined the term gibberellin ?


What is C/N ratio ?

C/N ratio is the ratio of carbohydrates and nitrogenous compounds which regulate the growth in plants. 

 Term kinetinwas coined by whom ?

Skoog and Miller.

 Give the types of auxins.

Auxins are of two types :

(1) Natural auxins : These are naturally occuring auxins, isolated from plants and are regarded as phytohormones e.g. IAA. NAA etc.

(2) Synthetic auxins : These are synthesized by artificially e.g. IBA 2,4-D etc.

Who isolated auxin and from where ?

Auxin was isolated by F.W. Went from tips of coleoptiles of oat seedling.