summary of chapter 6 tissues class 9(plant cells)
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Science Class 9 Notes Chapter 6 TISSUES
1. Tissue is a group of cells having similar origin, structure& function. Study of tissues is called Histology
2. In unicellular organism (Amoeba) single cell performs all basic functions, whereas in multi-cellular organisms (Plants and Animals) shows division of labor as Plant tissue & Animal tissues.
3. Plant tissues are two types: Meristems & Permanent tissues.
4. Meristems: The Meristems are the tissues having the power of cell division. It is found on those region of the plant which grows.
5. Types of Meristems;
1. The Apical meristems – It is present at the growing tip of the stem and roots and increases the length.
2. The lateral meristems - present at the lateral side of stem anf root (cambium) and increases the girth.
3. The intercalary meristems - present at internodes or base of the leaves and increases the length between the nodes.
26. Permanent tissues: Two types such as Simple permanent tissues & Complex permanent tissues.
a) Simple permanent tissues: subdivided as
(i): Parenchyma: Tissues provide the support to plants.They are loosly packed and has large intracellular space.
- Parenchyma with chlorophyll which performs photosynthesis is called as chlorenchyma.
- The parenchyma with large air spaces to give buoyancy is called as aerenchyma .Parenchyma also stores food and water.
(ii) Collenchyma: Tissue provides mechanical support, thickened at the corners, have very little intercellular space. It allows easy bending of various parts of a plants without breaking
(iii) Sclerenchyma: Tissue makes the plant hard and stiff, thickened due to lignin and no intercellular space. Cells of this tissue are dead and commonly seen in the husk of coconut.
Answer:
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Living organisms in this world comprise of cells.
There are unicellular as well as multicellular organisms present in this world.
In unicellular organisms, the only single cell is capable of performing several functions such as Respiration, Digestion and Clearing of the cell.
In multicellular organisms, there is a division of labor. There are different types as well as groups of cells that perform different functions in a multicellular organism. For Example, In animals muscle cells are responsible for causing movement, nerve cells are responsible for carrying messages and signals from one part of the body to another and blood is responsible for transportation of food and oxygen to different parts of the body.
In plants, there are vascular tissues that are responsible for carrying food and water two different parts of a plant.
The Formation of Tissues
Cells form groups cells that need to perform a single task often group together.
This grouping of cells together to perform a function efficiently is called a Tissue.
For Example, Muscles and Blood.
The tissue cells have the same structure and they perform the same function.
Tissues of Plants and Animals
Plant Tissues Animal Tissues
Plants do not move so their tissues are predominantly the ones that provide support to them so that they can stand erect.
Animals need more energy as compared to plants because they are not stationary. Their tissues are the ones that can support movement.
These tissues are made up of dead cells because dead cells can also provide mechanical strength to the plants and do not require much maintenance.
The tissues in case of animals are made up of living cells so that they can move and perform several functions.
Only certain parts of the plant can grow. The tissues present in such regions of and divide themselves and form new tissues.
Cells in animals grow uniform early and not only in certain regions of the body.
The structure of plant tissues is not very specialized as compared to animals
The organs and organ systems in animals are highly developed.