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tissue class9
Answers
Answer:
Science NCERT Grade 9, Chapter 6, Tissues deals with the important concepts of a cluster of cells which are responsible to carry out a specific function in the human body. The discussion of the topic begins with a definition of tissues and the role they play in animals and humans. Thereafter, the differences between the structure and functions of plants and animals are discussed. The first part of the chapter, Tissues explains the plant tissues and its sub types: (a) meristematic tissues (b) permanent tissues.
The permanent tissues are further classified into (i) parenchyma (ii) collenchyma (iii) sclerenchyma. The entire concept is explained with the help of examples and diagrams. Subsequently, the structure and functions of guard cells and epidermal cells are covered along with their schematic view. The two types of complex permanent tissues:- phloem and xylem and their components are explained extensively along with a diagrammatic representation of each tissue. In the second part of the chapter, the following types of animal tissues are discussed: (a) epithelial tissues (b) connective tissues (c) muscular tissues (d) nervous tissues. Apart from this, the sub-classification of the above mentioned tissues is also explained in detail. The schematic view of each of the animal tissues is represented in the chapter, Tissues.
The following topics are covered in the chapter, Tissues - Are Plants and Animals Made of Same Types of Tissues?, Plant Tissues and Animal Tissues.
Explanation:
Science NCERT Grade 9, Chapter 6, Tissues deals with the important concepts of a cluster of cells which are responsible to carry out a specific function in the human body. The discussion of the topic begins with a definition of tissues and the role they play in animals and humans. Thereafter, the differences between the structure and functions of plants and animals are discussed. The first part of the chapter, Tissues explains the plant tissues and its sub types: (a) meristematic tissues (b) permanent tissues.
The permanent tissues are further classified into (i) parenchyma (ii) collenchyma (iii) sclerenchyma. The entire concept is explained with the help of examples and diagrams. Subsequently, the structure and functions of guard cells and epidermal cells are covered along with their schematic view. The two types of complex permanent tissues:- phloem and xylem and their components are explained extensively along with a diagrammatic representation of each tissue. In the second part of the chapter, the following types of animal tissues are discussed: (a) epithelial tissues (b) connective tissues (c) muscular tissues (d) nervous tissues. Apart from this, the sub-classification of the above mentioned tissues is also explained in detail. The schematic view of each of the animal tissues is represented in the chapter, Tissues.
The following topics are covered in the chapter, Tissues - Are Plants and Animals Made of Same Types of Tissues?, Plant Tissues and Animal Tissues.