This concept mainly deals with the ultrastructure and functions of the cells and tissues inside human bodies. Here the students will be introduced to a plant cell parts with its structure and animal cell parts. After reading the concept, students will be able to:
Each concept is explained to class 4 students using descriptions, illustrations, and concept maps. After you go through a concept, assess your learning by solving the two printable worksheets given at the end of the page.
Download the worksheets and check your answers with the worksheet solutions for the concept of Cells and Tissues provided in PDF format.
Parts of an animal cell | Structure and functions |
1. Cell Membrane | It is the thin lining that covers the cell. |
2. Cytoplasm | A fluid-like substance inside the cell. |
3. Nucleus | It is located at the centre of the cell and controls all activities of the cell. |
4. Mitochondria | Numerous mitochondria are present in the cytoplasm. It produces energy to keep the cell active. |
5. Ribosome | Ribosomes are present in large numbers in the cytoplasm. They help in protein synthesis. |
Parts of a plant cell | Structure and functions | |
1. Cell Wall | It is the outermost covering of the plant cell. It is made up of waxy materials and protects the cell from external stress. | |
2. Cell Membrane | It is the thin lining that covers the cell. | |
3. Cytoplasm | It is the fluid-filled matrix that is present inside the cell. | |
4. Vacuoles | These are closed fluid-filled pouch-like structures present inside the cytoplasm. | |
5. Nucleus | It is located either in the centre of the cell or may shift to the sides. The nucleus controls all activities of the cell. | |
6. Plastid | Plastids are present in the cytoplasm of all plant cells. They store food and contain colourful pigments. Green plastids are called chloroplasts. | |
Plant cells also have ribosomes and mitochondria in the cytoplasm. |
Example:
Epithelial tissue, which makes our skin; muscle tissue which makes our body muscles.
Matrix: A jelly-like substance that is present inside all cells.
Membrane: A thin layer that forms the outer lining of a cell.
Millions of cells together make a tissue. Several tissues together make an organ, and several organs together make our body.