Page 5 - lesson notes-Plant Growth& Movement

2. The growth of given system per unit time expressed on a common basis is called relative
growth rate.

Condition for growth

Necessary condition for growth includes water, oxygen and essential elements. Water
is required for cell enlargement and maintaining turgidity. Water also provide

medium for enzymatic conditions.
Protoplasm formation requires water and micro and macronutrients and act as

source of energy.

Optimal temperature and other environmental conditions are also essential for
growth of the plant.

Cells produced by apical meristem become specialized to perform specific function.

This act of maturation is called differentiation.
The living differentiated cells that have lost ability of division can regain the capacity

of division. This phenomenon is called dedifferentiation. For example interfascicular

cambium and cork cambium.
Dedifferentiated cells mature and lose the capacity of cell division again to perform

specific functions. This process is called redifferentiation.

Development

It is the sequence of events that occur in the life history of cell, organ or organism which

includes seed germination, growth, differentiation, maturation, flowering, seed formation
and senescence.

Sequence of development process in plant cell

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