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CBSE Class 9 Biology Notes for Chapter 2 Tissues

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              CHAPTER 2 TISSUES
 
 
PLANT TISSUES

  • Meristematic Tissue: This is the dividing tissue. The growth in plants occurs in certain specific regions because the meristematic tissues are present in these regions only. These tissues are classified into three types depending on where they are present:

 

  • Apical: Apical meristem is present at the growing tips of stems and root. It increases the length.

 

  • Lateral: The lateral meristem is responsible for the increase in the girth of the stem and root.

 

  • Intercalary: The intercalary meristem is present at the base of the leaves or internodes on twigs.

 

  • Permanent Tissue: When the cells lose their ability to divide, they form a permanent tissue. The following are the different types of permanent tissues:

 

  • Simple permanent tissue: There are three types of simple tissues- Parenchyma, collenchyma and sclerenchyma.

 

  • Complex permanent tissue: Tissues like xylem and phloem are complex tissues.

 
ANIMAL TISSUES

  • Epithelial tissue: The covering or protective tissues in the animal body are called epithelial tissues.
  • Connective tissues: The cells of the tissues are loosely spaced and embedded in an intercellular matrix. Example of connective tissues are blood, bone, cartilage, etc.
  • Muscular tissues: Muscular tissues consist of elongated cells also called muscle fibres. These are the tissues responsible for movement in human body.
  • Nervous tissue: These tissues are made of neurons that receive and conduct impulses.

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