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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

Explain different phases of growth.


Plant growth has following three phases

(i) Meristematic Phase - This phase is characterised by constantly dividing cells. The cells are rich in protoplasm, possess large conspicuous nuclei. Their cell walls are primary in nature, thin and cellulosic with abundant plasmodesmatal connections. 

(ii) Elongation Phase - The cells of this phase elongate. Increased vacuolation, cell enlargement and new cell wall deposition are the characteristics of the cells in this phase.

(iii) Maturation Phase - The cells in this phase stop dividing and undergo differentiation and maturation.The cells of this zone, attain their maximal size in terms of wall thickening and protoplasmic modifications.



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.


 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 coined the term gibberellin ?

Yabuta.