Introduction Of Growth And Development Lecture In Urdu Hindi | Class 12 Biology

Описание к видео Introduction Of Growth And Development Lecture In Urdu Hindi | Class 12 Biology

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In This Video Lecture You Will Learn Basic Concept Of Introduction growth And Development

GROWTH AND DEVELOPMENT IN PLANTS
stem and root and they are of the following types.
its adult form constitute embryonic development. Growth is the permanent and
are young tissues or group of cells that retain the potential to divide. In lower plants, development proceeds, all sorts of the changes take place. The most obvious change the entire plant body is capable of growing, but in higher plants, the entire plant body
In plants growth and development involve cell division, elongation and diferentiation
of cells into tissues and then organs. Growth is an irreversible increase in size and but the rate of growth is not uniform throughout the plant body. At the beginning, the
these growing points are called meristems. These meristematic cells are located at the
A plant has a growth pattern called open growth. Throughout life, the plant adds new
down. In vascular plants, growth occurs through the activity of meristems. Meristems
organs such as branches, leaves and roots, enlarging from the tips of roots and shoot
(i) Apical Meristems
(i) Apical Meristems
The apical meristems are found at the tips of roots and shoot and are primarily
concerned with the extension of plant body. These are perpetual growth zones found
at the apices of roots and stems. They are responsible for increase in the number of
cells at the tips of roots and stem, so they play important role in primary growth
(ii) Intercalary Meristems
tissues. They are situated at the bases of internodes in many plants. They play important Role
These are the parts of apical meristem which get separated from apex by permanent
role in the production of leaves and lowers. These are of temporary nature.
(iii) Lateral Meristems
gymnosperms. Vascular and cork cambium are the examples of lateral meristem. They
play an important role in the increase in diameter of stem and root and in secondary
and fruits; while others are indeterminate i.e. they- grow by meristems that continually
growth are determinate i.e. they grow to certain size and then stop e.g. leaves, lowers
Lateral meristems are cylinders of dividing cells. They are present in dicots and
replenish themselves, remaining youthful e.g. vegetative root and stem.

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