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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 would be expected to happen if :

(a) GA3 is applied to rice seedlings.

(b) Dividing cells stop differentiating.

(c) A rotten fruit gets mixed with urripe fruits.

(d) You forget to add cytokinin to the culture medium

(a) The elongation of stem will occur at fast rate.

(b) An undifferentiated mass of cells is formed.

(c) The unripe fruits will ripen quickly.

(d) There will be no differentiation of shoot buds.

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 ?


 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.