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Plant Growth and Development

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Class 10 Class 12
Why the terrestial plants cannot germinate under water ?

The terrestrial plants do not have the system to absorb oxygen from the water. Since the plants need oxygen to germinate therefore when it is present under water it does not get the required amount of oxygen.

Who isolated auxin and from where ?

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

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 ?

Yabuta.

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.

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