can any body give me notes of class 9 chapter tissues in science
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Tissues Class 9 Notes – Here We have provided summary and revision notes for Class 9 Science Chapter 6. This CBSE notes contains CBSE Key Notes, CBSE Revision Notes, Short Key Notes, images, diagrams of the complete Chapter 6 titled Tissues of Science taught in class 9. If you are a student of class 9 who is using NCERT Textbook to study Science, then you must come across Chapter 6 Tissues. After you have studied lesson, you must be looking for notes to memorize. Here you can get complete Chapter 6 Tissues class 9 notes in one place. For a better understanding of this chapter, you should also see NCERT Solutions for Class 9 Science Chapter 6 Tissues.
CBSE Class 9 Science Notes Chapter 6 Tissues Pdf free download is part of Class 9 Science Notes for Quick Revision. Here we have given NCERT Class 9 Science Notes Chapter 6 Tissues.
Facts that Matter
Tissues
Group of cells having a common origin and similar function are termed as tissues.
A. Plant tissues: On the basis of the dividing capacity, plant tissues are of two types:
Meristematic tissues
Permanent tissues
1. Meristematic tissues: Consist of actively-dividing cells. Meristematic tissues are of three types:
Apical meristem: Present at the growing tips of stems and roots. Important function: To increase the length of stems and roots.
Intercalary meristem: Present at the base of leaves or internodes. Important function: For the longitudinal growth of plants.
Lateral meristem: Present on the lateral sides of the stems and roots. Important function: To increase the thickness of stems and roots.
2. Permanent tissues: Formed from meristematic tissues, the cells in the tissue loose the ability to divider Permanent tissues are divided into two categories:
Simple permanent tissue: Consist of only one type of cells.
Types of simple permanent tissues:
1) Parenchyma: Composed of unspecialised living cells with relatively thin cell walls, intercellular space, present in soft parts of the plant. Their main function is storage.
2) Collenchyma: Composed of living and elongated cells with cell walls irregularly thickened at the comers. No intercellular space. It provides mechanical support and elasticity to plant. It helps in bending of leaves and stems.
3) Sclerenchyma: Composed of long, narrow, and thick-walled cells. This tissue is made up of dead cells and there are no intercellular spaces. Sclerenchyma cells are dead, present in seeds, nuts, the husk of a coconut, fibres of jute etc.
4)Complex permanent tissue: Made up of more than one type of cells (Conducting tissues.)
Types of complex permanent tissues:
5) Xylem: Conducts water and minerals from the roots to the different parts of the plant.
Composed of four different types of cells
tracheids, vessels, xylem parenchyma and xylem fibres.
1) Phloem: Conducts food material from the leaves to the different parts of the plant.
Composed of four different types of cells—sieve tubes, companion cells, phloem parenchyma and phloem fibres.
Protective tissue: It is made of a single layer of cells. E.g., epidermis. The epidermis of the leaf bears stomata.
B. Animal tissues: Animal tissues are classified into four types based on the functions they perform:
Epithelial
Connective
Muscular
Nervous
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