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Detailed Explanation: Cell Organelles Video Lecture | Science Class 9
FAQs on Detailed Explanation: Cell Organelles Video Lecture - Science Class 9
| 1. What are cell organelles? |  |
Ans. Cell organelles are specialized structures within a cell that perform specific functions. They are often compared to the organs in a human body, as they have specific roles in maintaining the cell's overall structure and carrying out various metabolic activities.
| 2. What is the function of the nucleus in a cell? | |
Ans. The nucleus is a cell organelle that serves as the control center of the cell. It contains the cell's genetic material in the form of DNA, which carries the instructions for the cell's growth, development, and reproduction. The nucleus also directs the synthesis of proteins and regulates the cell's activities.
| 3. How does the mitochondria contribute to cellular energy production? | |
Ans. Mitochondria are known as the powerhouses of the cell because they are responsible for producing energy in the form of ATP (adenosine triphosphate). They carry out cellular respiration, a process that converts nutrients into usable energy. Mitochondria break down glucose and other molecules through a series of chemical reactions, releasing energy-rich molecules that are used to generate ATP.
| 4. What is the function of the endoplasmic reticulum (ER) in a cell? | |
Ans. The endoplasmic reticulum (ER) is a network of membranes within the cell that is involved in protein synthesis, lipid metabolism, and detoxification. The ER consists of two regions: rough ER, which is studded with ribosomes and involved in protein synthesis, and smooth ER, which lacks ribosomes and is involved in lipid synthesis and detoxification of drugs and toxins.
| 5. How do lysosomes contribute to cellular waste disposal? | |
Ans. Lysosomes are cell organelles that contain digestive enzymes responsible for breaking down waste materials, cellular debris, and foreign substances. They play a crucial role in cellular waste disposal by digesting worn-out organelles, recycling their components, and removing unwanted substances from the cell. Lysosomes are also involved in programmed cell death (apoptosis) and defense against pathogens.
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