Zigya Logo

Chapter Chosen

Plant Growth and Development

Book Chosen

Biology

Subject Chosen

Biology

Book Store

Download books and chapters from book store.
Currently only available for.
CBSE Gujarat Board Haryana Board

Previous Year Papers

Download the PDF Question Papers Free for off line practice and view the Solutions online.
Currently only available for.
Class 10 Class 12
Why is not any one parameter good enough to demonstrate growth throughout the life of a flowering plant?

Different plant parts, tissues and cells grow at different rates in various stages of the life cycle of a plant. Moreover it is difficult to measure the increase in the protoplasm directly. Therefore, a number of parameters are taken into account to demonsstrate growth thrught out the life a flowering plants, so that a approximate growth rate. 

Who isolated auxin and from where ?

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


Who coined the term gibberellin ?

Yabuta.

 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. 

 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.