Tissues, Organs, Organ System, Organism_2_IX_CBSE.pptx

we should know the structure of animal and plants. cell the unit of life also transformed into the tissue, organ, and organ system. further they makes a whole body (Animal and plant).

1. Tissues, Organs, Organ System, Organism: Structure and functions of animal and plant tissues (only four types of tissues in animals; Meristematic and Permanent tissues in plants). Subject : Science Class IX, CBSE board Unit-II: Organization in the Living World Marks carries: 22 [email protected] Tissue is a group of cells that have similar structure and that function together as a unit. A nonliving material, called the intracellular matrix, fills the spaces between the cells. Organ is a part of the body that made up of cells and tissues that perform a specific function. Example of organs include the heart, lungs, stomach, liver, kidney, skin, spleen etc.

2. Organ system is a biological system consisting of a group of organs that work together to perform one or more functions. Mainly there are 12 organs system in the human body. They are- Nervous syatem Respiratory syatem Cardiovascular system Digestive system Urinary system Muscular system Skeletal system Integumentary system Lymphatic system Endocrine system Reproductive system (Male and Female).

3. Meristematic Tissue : Meristemetic tissues support the plant’s primary growth. These tissues’ cells regularly divide, and they can be found at the root and stem tips. Spherical, tightly packed cells with no intestitial space are a common feature of meristematic tissues.These cell contain thick cytoplasm surrounding the nucleus. Depending on where they are, meristems can be divided into – Apical meristems - At the growing tip of the stem and roots apical meristems are present. They help increases the length of the plant. Lateral meristems - Lateral meristems are located at the lateral portion of the root or stem. These cells help in increasing the girth of the plant. They include cork cambium and vascular cambium which assist in secondary growth. Intercalary meristems - These tissues are usually located in the internodes, nodes, or base of the direction of light also they help in increasing the height of the plant.

4. Permanent tissue : Permanente tissues are those that have developed and lost the capacity to reproduce. The permanent tissues are formed by the division and differentiation of the meristematic tissues.