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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
How will you induce lateral branching in a plant, which normally does not produce them ? Give reason in support of your answer.

Lateral branching in a plant can be induced by removing the apical bud. Auxin causes the phenomenon of apical dominance, i.e. suppression of development of lateral buds into branches in the presence of apical bud. This suppresses the growth of the lateral buds. On removal of the apical buds, Auxin hormone is removed and the inhibition of apical dominance can be overcome to allow the lateral branches to develop.

 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 coined the term gibberellin ?


Who isolated auxin and from where ?

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

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.