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FAQs on Chapter-10 Respiration in Organisms (e-book). - Class 7
| 1. What is respiration in organisms? |  |
Ans. Respiration in organisms is the process by which they obtain energy from food and release waste products like carbon dioxide and water. It involves the breakdown of food molecules into simpler substances and the release of energy in the form of ATP (adenosine triphosphate).
| 2. How do organisms respire? | |
Ans. Organisms can respire through different mechanisms. In humans and most animals, respiration occurs through breathing. Oxygen is inhaled through the nose or mouth, travels down the respiratory system, and reaches the lungs where it is exchanged with carbon dioxide. In plants, respiration occurs in the cells of leaves, stems, and roots, where oxygen is absorbed from the surrounding air or soil.
| 3. What is the difference between respiration and breathing? | |
Ans. Respiration and breathing are often used interchangeably, but they are not the same. Respiration refers to the overall process of obtaining energy from food and releasing waste products. It includes both breathing and cellular respiration. On the other hand, breathing is the physical act of inhaling and exhaling air to supply oxygen to the body and remove carbon dioxide.
| 4. Why is respiration important for organisms? | |
Ans. Respiration is essential for organisms as it provides them with the energy needed for various life processes. Through respiration, organisms generate ATP, which acts as a fuel to power cellular activities such as growth, movement, reproduction, and maintaining body temperature. Without respiration, organisms would not be able to survive and carry out their daily functions.
| 5. Can respiration occur without oxygen? | |
Ans. Yes, respiration can occur without oxygen. This type of respiration is called anaerobic respiration. It takes place in the absence of oxygen and is common in certain organisms like bacteria and yeast. Anaerobic respiration produces less energy compared to aerobic respiration (which requires oxygen), but it can sustain life in environments with low or no oxygen availability.
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Jan 06, 2025
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