What are permanent tissue ?
A group of cells which are similar in origin; similar in structure and similar in function are called permanent tissue.
Types of permanent tissues:
1. Simple permanent tissues
-Storage of food,
-Providing turgidity to softer parts,
-Providing rigidity to tissues when prosenchymatous.
-Protection and checking water loss in the form of epidermis,
-Formation of water absorbing epiblema in root,
-Lateral conduction in the form of xylem and phloem parenchyma
-Photosynthesis in the form of chlorenchyma.
-Providing buoyancy and storage of metabolic gases in the form of aerenchyma.
-It provides mechanical strength to young dicot stems, petioles and leaves,
-While providing mechanical strength, collenchyma also provides flexibility
to the organs and allows their bending, e.g., Cucurbita stems,
-It prevents tearing of leaves,
-Collenchyma allows growth and elongation of organs,
-Being living, its cells store food,
-Its cells often contain chloroplasts and take part in photosynthesis.
-Sclerenchyma is the chief mechanical tissue of the mature plant organs,
-It allows the plant organs to tolerate bending, shearing, compression and
pull caused by environmental factors like wind.
-It provides rigidity to leaves and prevents their collapsing during
2. Complex permanent tissues
Phloem is responsible for the conduction or transport of organic food
synthesized by the s to different part of plant body.
The function of xylem is to transport water and minerals from the root to the
leaves of plants. It also provides support to plants.
3. Special tissues
i. Lactiferous tissues
It is thin walled tubes like tissue which produce latex (milky juice).
This tissue forms glandular structure which secrete or excrete chemical