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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
What is antagonistic action in plants?

Auxin inhibits growth of lateral buds whereas cytokinins promote it. This is an example of antagonistic action of the two hormones in plants.

Who isolated auxin and from where ?

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

Who coined the term gibberellin ?


 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.

 Term kinetinwas coined by whom ?

Skoog and Miller.

What is C/N ratio ?

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