Biology Class 9 Chapter 5: Cell Division, Tissues, Cell Structure and Functions Quiz

Biology Class 9 Chapter 5: Cell Division, Tissues, Cell Structure, and Cell Functions

Cell Division

Cell division is the process by which the cell grows and renews itself, creating a new cell for the body to use in different parts. It is essential for the growth of an organism and the repair of damaged tissues. There are two main types of cell division:

• Mitosis: This is the process by which the nucleus of a cell divides, leading to the formation of two identical nuclei.

• Meiosis: This is a type of cell division that occurs in the reproductive cells of an organism, resulting in the formation of four genetically unique cells.

Tissues

Tissues are groups of cells that work together to perform specific functions. There are four main types of tissues:

1. Epithelial Tissue: This type of tissue covers the surface of the body and lines the internal organs.

2. Connective Tissue: This tissue connects different parts of the body and provides support.

3. Muscular Tissue: This tissue is responsible for movement and is found in muscles.

4. Nervous Tissue: This tissue carries signals between different parts of the body and is found in the brain and nerves.

Cell Structure

The structure of a cell is divided into three main parts:

1. Cell Membrane: This is a thin layer that surrounds the cell and controls the movement of substances in and out of the cell.

2. Cytoplasm: This is the jelly-like substance inside the cell membrane that contains all the organelles.

3. Nucleus: This is the control center of the cell and contains most of the cell's genetic material.

Cell Functions

Cells have various functions in the body, including:

1. Metabolism: Cells convert food into energy and other necessary substances.

2. Growth and Reproduction: Cells grow and divide to create new cells for the body.

3. Repair: Cells can repair damaged tissues and organs.

4. Excretion: Cells help in the removal of waste products from the body.

Plant and Animal Tissues

Plants and animals have different types of tissues, with plants having additional tissues such as:

1. Xylem: This tissue transports water and minerals from the roots to the leaves.

2. Phloem: This tissue transports sugars and other nutrients from the leaves to other parts of the plant.

3. Collenchyma: This tissue provides support and is found in the walls of some cells in the plant.

In summary, cell division is an essential process for the growth and repair of the body. Tissues are groups of cells that work together to perform specific functions. Cell structure is divided into three main parts: cell membrane, cytoplasm, and nucleus. Cells have various functions in the body, and plants and animals have different types of tissues to perform their specific functions.