Revision Notes For For Class 11 Biology Chapter 15 Plant Growth And Development

In all living organisms, growth is generally referred to as an irreversible increase in the size, the number of cells, and the whole organism. The development is related to all the changes that occur in an organism from the birth till the death.

CBSE Notes Class 11 Biology Chapter 15 Plants, Growth and Development

In plants, Growth is mainly classified into:

Primary growth: It is the growth that results from the roots extending from shoots giving rise to a primary plant.

Secondary growth: It is the growth that results from the cell division in the lateral meristem giving rise to secondary vascular tissue.

Plant growth regulators, which are also called the plant hormones or phytohormones play a vital role in controlling the aspects Growth and Development of plants. They are the chemical substances, produced within plants. Auxins, Gibberellins, Cytokinins, Ethylene, and Abscisic acid are the five important Plant hormones which promote growth, development, and other physiological functions in the plant cells and tissues.

For more information about the Plant – Growth and Development, click on the below-mentioned links.

Growth and Development Gibberellins In Plants
Plant Growth Regulators Plant Hormones
Cytokinins Differentiation And Development Process in Plants

Frequently asked Questions on CBSE Class 11 Biology Notes Chapter 15: Plant Growth and Development


What are functions of ‘Cytokinins’?

Cytokinins are essential plant hormones. By stimulating cell division, they regulate shoot meristem size, leaf primordia number, and leaf and shoot growth. They can stimulate both the differentiation and the outgrowth of axillary buds.


What are ‘Plant hormones’?

Plant hormones (also known as phytohormones) are organic substances that regulate plant growth and development.


What are ‘Gibberellins’?

Gibberellins are plant hormones that regulate various developmental processes, including stem elongation, germination, dormancy, flowering, flower development, and leaf and fruit senescence.


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