Tissues CBSE Class 9 Science Revision Notes Chapter 6
Explore our comprehensive Science revision notes for Class 9, Chapter 6: Tissues, crafted by our expert educators at MBKH. Aligned with the latest CBSE syllabus, these notes are designed to provide thorough coverage of each topic within the chapter. By studying these detailed notes, you can streamline your exam preparation, revise effectively, and strengthen your understanding of key concepts. Access our online CBSE Science revision notes on Tissues conveniently through our website anytime, ensuring you have the essential resources at your fingertips whenever you need them.
Class 9 revision notes for Chapter 6 Tissues include the following topics:
- Formation of tissues
- Tissues of plants and animals
- Class 9 revision notes for Chapter 6 Tissues include the following topics:
- Formation of tissues
- Tissues of plants and animals
- Meristematic tissues
- Epidermis
- Permanent tissues
- Transpiration
- Complex permanent tissues
- Xylem and Phloem
- Epithelial tissue
- Connective tissues
- Blood
- Lymph
Quick Review of Chapter 6 Tissues
1. For instance, in animals, muscle cells facilitate movement, nerve cells transmit messages and signals throughout the body, and blood transports nutrients and oxygen to various organs and tissues.
2.In multicellular organisms, division of labor is evident through various types and groups of cells that specialize in distinct functions within the organism.
3.In unicellular organisms, a single cell carries out multiple functions including respiration, digestion, and maintaining cellular cleanliness.
4.In plants, vascular tissues is responsible transport both food and water to various parts of the plant.
Free Revision Notes for Class 9 Science Chapter 6 Tissues
The Formation of Tissues
1.Cells organize into specialized groups to efficiently carry out specific tasks.
2.The grouping of cells to efficiently perform a specific function is termed as tissue.
3.Tissue cells share similar structures and collectively perform specific functions.
Tissues of Plants and Animals
1. Plants do not move from place to place, so their tissues primarily provide structural support, enabling them to maintain an upright position.
2. These tissues are composed of dead cells because these cells can still provide mechanical strength to the plants without needing active maintenance.
3. Certain regions of a plant, such as meristematic tissues, have the ability to actively divide and form new tissues, contributing to growth in specific areas.
4. Certain regions of a plant, such as meristematic tissues, have the ability to actively divide and form new tissues, contributing to growth in specific areas.
ANIMAL TISSUES
1. Animals require more energy compared to plants because they are mobile. Their tissues are specialized to support movement and perform various physiological functions efficiently.
2. Animal tissues are primarily composed of living cells, which enable them to move and carry out a wide range of functions necessary for their survival and adaptation to their environments.
3.Cells in animals generally grow uniformly throughout the body during early development, rather than in specific localized regions.
4. Organs and organ systems in animals are highly developed, allowing them to perform complex functions and respond effectively to their environments.
Plant Tissues
Meristematic Tissues
1. Certain parts of a plant exhibit growth, facilitated by specialized tissues known as meristematic tissues.
2. Meristematic tissues have the ability to divide and generate new cells, thereby contributing to the growth and development of plants.
3. Meristematic tissues typically have thin cell walls composed of cellulose.
4. Meristematic tissues are characterized by dense nuclei and cytoplasm, but they lack prominent vacuoles.
5. They can further be classified differently based on the areas of the plants where they are located -
a. Apical meristematic tissues
b.Lateral meristamatic tissues
c. Intercalary meristematic tissue
APICAL MERISTAMATIC TISSUES
They regulate the growth of stems and roots in plants.They are found on the tips of the roots and stems.
LATERAL MERISTAMATIC TISSUES
These tissues are present at internodes of stem regions between the places at which leaves attach. |
- Differentiation - The process by which cells of the meristematic tissues convert themselves into permanent tissue by taking a fixed shape, size and function is called differentiation.
- Simple Permanent Tissues
- Parenchyma
- Aerenchyma
- Chlorenchyma
- Collenchyma
- Sclerenchyma
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- PARENCHYMA PERMANENT TISSUES
These tissues are responsible for photosynthesis, storage of food, gaseous exchange and floating of plants.
They are a group of living cells with a cell wall made of cellulose.
The parenchyma cells have large intercellular spaces between them.
There are thin walls that surround each cell.
They are found in leaves and newly formed branches.
These tissues are responsible for providing flexibility to the plants so that they can bend easily.
They are a group of living cells with a cell wall made of cellulose and pectin.
They have a little intercellular space in between them.
The cells present in these tissues are broad and irregularly thick at corners.
They are present in the leaves and stems of a plant.
SCLERENCHYMA PERMENANT TISSUESThese tissues are responsible for making plants hard and rigid.
They are made up of dead cells having a cell wall made of lignin.
The cells do not have any intercellular spaces.
The cells have a long structure with thick walls.
They are found in stems, veins of the leaves and coverings of nuts and seeds.
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