NCERT Solutions for Class 9 Science Chapter 5
The Fundamental Unit of Life
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Exercises Questions
Page No-67
Questions No- 5
Which organelle is known as the powerhouse of the cell? Why?
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Mitochondria are known as the powerhouse of the cell because they contain enzymes that are needed for stepwise oxidation of food stuffs (carbohydrate, fats and lipids) present in the cells to CO₂ and water. Oxidation of food releases energy which is used to form high-energy ATP (adenosine triphosphate) molecules. ATP is known as Energy Currency of the cell and it is used as cellular fuel. Energy stored in ATP is used to bring about energy requiring activities of the cell such as photosynthesis, protein synthesis and muscle contraction.
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Mitochondria: The Powerhouse of the Cell
1. Energy Production:
– Mitochondria are like cellular power stations, producing energy in the form of ATP.
2. ATP Generation:
– They perform cellular respiration, a process that breaks down food molecules to create ATP, which fuels various cellular activities.
3. Vital Cellular Role:
– ATP is essential for cell functions like movement, growth, repair, and maintaining internal balance (homeostasis).
4. Cellular Respiration:
– Within the mitochondria, cellular respiration takes place in multiple stages, converting nutrients (like glucose) into ATP through a complex series of reactions.
5. Abundance in High-Energy Cells:
– Cells with high energy demands (e.g., muscle cells) contain many mitochondria to meet their energy needs.
6. Unique Structure and DNA:
– Mitochondria have a distinct double-membrane structure and possess their own DNA, enabling them to function independently within the cell.
7. Evolutionary Origin:
– Mitochondria likely originated from ancient prokaryotic organisms that formed a symbiotic relationship with early eukaryotic cells, leading to their presence in today’s cells.
So, when we call mitochondria the powerhouse of the cell, we’re highlighting their crucial role in producing ATP—the energy source that keeps cells running smoothly and supports various life-sustaining activities.