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FAQs on Visual Worksheet: Cell structure - Science Class 9

1. What are the main components of a cell structure?
Ans. The main components of a cell structure include the cell membrane, cytoplasm, nucleus, mitochondria, ribosomes, endoplasmic reticulum, Golgi apparatus, lysosomes, and sometimes chloroplasts in plant cells. Each component has a specific function that contributes to the overall operation and health of the cell.
2. How does the cell membrane function in a cell?
Ans. The cell membrane functions as a protective barrier that regulates the movement of substances in and out of the cell. It is selectively permeable, meaning it allows certain molecules to pass while blocking others. This is crucial for maintaining homeostasis within the cell.
3. What is the role of the nucleus in a cell?
Ans. The nucleus is often referred to as the control center of the cell. It houses the cell's genetic material (DNA) and is responsible for regulating gene expression and cell division. The nucleus also plays a key role in the synthesis of ribosomes, which are essential for protein production.
4. What are mitochondria and why are they important?
Ans. Mitochondria are known as the "powerhouses" of the cell because they produce ATP (adenosine triphosphate), which is the primary energy currency of the cell. They play a crucial role in cellular respiration, converting nutrients into energy, and are essential for the cell's energy metabolism.
5. What is the difference between prokaryotic and eukaryotic cells?
Ans. The main difference between prokaryotic and eukaryotic cells is that prokaryotic cells do not have a defined nucleus or membrane-bound organelles, while eukaryotic cells do. Prokaryotes are generally smaller and simpler in structure, while eukaryotes are more complex and can be unicellular or multicellular organisms.
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