ï»¿ Write a note on Growth curve. from Biology Plant Growth and Development Class 11 Assam Board

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Plant Growth and Development

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Write a note on Growth curve.

Growth curve is the graphical representation of growth against time, thus it is also called sigmoid curve.

A typical S-shaped grand period of growth curve

It has three phases :

(1)Â Lag phase: It is in the beginning of the growth and represents the time in which minimum growth occurs. The growth is very slow in this phase.Â

(2)Â Log/Exponential phase : It represents the phase of maximum growth. If log phase persists for longer time then growth is linear. Â Both the progeny cells following mitotic cell divisionÂ retain the ability to divide and continue to do so.

(3)Â Stationary phase : It is the phase in which no growth occurs. TheÂ limited nutrient supply, the growthÂ slows down leading to a stationary phase.

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Who coined the term gibberellin ?

Yabuta.
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Who isolated auxin and from where ?

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

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Â Give the types of auxins.

Auxins are of two types :

(1)Â Natural auxins : These are naturally occuring auxins, isolated from plants and are regarded as phytohormones e.g. IAA. NAA etc.

(2)Â Synthetic auxins : These are synthesized by artificially e.g. IBA 2,4-D etc.

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Â Term kinetinwas coined by whom ?

Skoog and Miller.
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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.Â
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