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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
In what ways can you compare growth of living systems quantitatively?

Quantitative comparisons between the growth of living system can  be made in two ways :

(i) By measuring and comparing the total growth per unit time. This is called the absolute growth rate.

(ii) The growth of the given system per unit time expressed on a common basis, e.g., per unit initial parameter. This is called the relative growth rate.

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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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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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Who coined the term gibberellin ?

Yabuta.
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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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