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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
Both growth and differentiation in higher plants are open. Comment.

Open growth : It is a type of growth where in new cells are always being added to the plant body by the activity of the meristem.

Growth is considered to be open. Plant growth is unique because plants retain the capacity for unlimited growth throughout their life. The meristems present in different locations have the capacity to divide and self-perpetuate. The daughter cells may lose the capacity to divide and such cells make up the plant body. ns in which they are formed.

Diagrammatic representation of locations of root apical meristem, shoot apical meristem and vascular cambium. Arrows exhibit the direction of growth of cells and organ

Differentiation in plants is open, because cells/tissues arising out of the same meristem have different structures at maturity. The location also decides the final
structure of a cell/tissue at maturity. For example, cells positioned away from root apical
meristems differentiate as root-cap cells, while those pushed to the periphery mature as epidermis.

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Who isolated auxin and from where ?

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

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Who coined the term gibberellin ?

Yabuta.
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What is C/N ratio ?

C/N ratio is the ratio of carbohydrates and nitrogenous compounds which regulate the growth in plants.
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Term kinetinwas coined by whom ?

Skoog and Miller.
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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.

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