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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 are the conditions for Growth?

The conditions necessary for growth are 

i. Water - Water is required for the enlargement of the cells and various metabolic processes. Water also provides the medium for the enzymatic reactions necessary for the growth. Water imparts turgidity which helps in extension growth of the cells. 

ii. Oxygen - Oxygen helps in releasing the metabolic energy that is needed for growth activities. It is needed for the respiration of the cells. 

iii. Nutrients - are required by plants for the synthesis of protoplasm and act as source of energy.

iv Temperature - Optimum temperature is required the growth

v. Environmental signals - Light and gravity also affect certain phases/stages of growth

 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.

Who isolated auxin and from where ?

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

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 ?


 Term kinetinwas coined by whom ?

Skoog and Miller.