Page 1 - lesson notes-Plant Growth& Movement

CBSE Quick Revision Notes
CBSE Class-11 Biology

CHAPTER-15
PLANT GROWTH AND DEVELOPMENT

Root, stem, leaves, flowers, fruits and seeds arise in orderly manner in plants. The

sequence of growth is as follows-
Plants complete their vegetative phase to move into reproductive phase in which

flower and fruits are formed for continuation of life cycle of plant.

Development is the sum of two processes growth and differentiation. Intrinsic and
extrinsic factors control the process of growth and development in plants.

Growth is a permanent or irreversible increase in dry weight, size, mass or volume of

cell, organ or organism. It is internal or intrinsic in living beings.

In plants growth is accomplished by cell division, increase in cell number and cell
enlargement. So, growth is a quantitative phenomenon which can be measured in

relation to time.

Plant growth is generally indeterminate due to capacity of unlimited growth
throughout the life. Meristem tissues are present at the certain locality of plant body.

The plant growth in which new cells are always being added to plant body due to
meristem is called open form of growth.

Root apical meristem and shoot apical meristem are responsible for primary

growth and elongation of plant body along the axis.
Intercalary meristem located at nodes produce buds and new branches in plants.

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