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Plant Growth and Development

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Biology

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Biology

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
Sometimes the fruits fall even before they are ripe. Give reasons.

Fall of fruits is due to formation of abscission layers in their stalk. The formation of this layer is controlled by hormones auxins present in leaves. Abscission layer is sometimes formed earlier leading to fruit fall even before they ripe. Artificially it is done by spraying hormones encouraging abscission.

 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. 

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 ?

Yabuta.

 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.