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FAQs on Chapter 8: Cell Structure and Functions - PPT, Science, Class 8, CBSE

1. What is the structure of a cell?
Ans. A cell is the basic unit of life and has a complex structure. It consists of three main parts - the cell membrane, cytoplasm, and nucleus. The cell membrane encloses the cell, separating its internal environment from the external environment. The cytoplasm is a gel-like substance that fills the cell and contains various organelles. The nucleus is the control center of the cell and contains the genetic material.
2. What are the functions of a cell membrane?
Ans. The cell membrane has several important functions. It regulates the movement of substances in and out of the cell, maintains the cell's shape and integrity, and protects the cell from its surroundings. It also helps in cell communication and recognition, allowing cells to interact with each other and with the external environment.
3. What are organelles and their functions in a cell?
Ans. Organelles are specialized structures within a cell that perform specific functions. Some of the important organelles include the nucleus, mitochondria, endoplasmic reticulum, Golgi apparatus, lysosomes, and chloroplasts (in plant cells). The nucleus controls the cell's activities and contains genetic material, while mitochondria generate energy for the cell. The endoplasmic reticulum and Golgi apparatus are involved in protein synthesis and transport, and lysosomes break down waste material. Chloroplasts are involved in photosynthesis in plant cells.
4. What is the difference between plant and animal cells?
Ans. Plant cells and animal cells have several differences. Plant cells have a cell wall and chloroplasts, while animal cells do not. They also have a large central vacuole, while animal cells have small or no vacuoles. Plant cells are generally rectangular or square in shape, while animal cells are round or irregularly shaped. Finally, plant cells are able to produce their own food through photosynthesis, while animal cells rely on external sources of food.
5. How do cells communicate with each other?
Ans. Cells communicate with each other through various means, including direct contact, chemical signals, and electrical signals. Direct contact occurs when cells physically touch each other, allowing for the transfer of molecules and information. Chemical signals are released by one cell and received by another, allowing for communication over longer distances. Electrical signals are used by certain cells, such as nerve cells, to rapidly transmit information over long distances.
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