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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

Writes notes on following :

(a) Senescence (b) Abscission

(c) Quiescence (d) Vivipary.

(a) Senescence : Senescence is the process of  ageing in plants. It is the period between maturity and death.

(b) Abscission: It is the natural falling of leaves, foliage branches, fruits, floral parts etc.

(c) Quiescence : It is the suspension of growth due to external factors. It is a period during which development is suspended.

(d) Vivipary : It is the process when seeds germinate inside fruits which are still attached to the mother plant.

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 coined the term gibberellin ?

Yabuta.

Who isolated auxin and from where ?

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

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