Important Points and Formulas of class 7 Science Chapter-Respiration in Organisms
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Important Points and Formulas of class 7 Science Chapter-Respiration in Organisms
May 19, 2022, 16:45 IST
Class 7 Science Chapter-Respiration in Organisms
Introduction
All living things need air (Oxygen) for their survival. Plants and animals need oxygen to release energy from their food. The energy stored in food molecules is released by their oxidation.
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The process which breaks down the food to release energy in the presence of oxygen and enzymes is called respiration.
- Breathing or external respiration: It is the process of inhaling fresh air (O 2 ) and exhaling used air (CO 2 ). It’s a mechanical process which involves pumping air in and out of the lungs.
- Cellular respiration: It is the chemical breakdown of glucose inside the cells.
- Aerobic Respiration: It is the process which involves the breakdown of glucose into CO 2 and water inside the body cells in the presence of oxygen.
- Anaerobic Respiration: It is the process which involves the breakdown of glucose into CO₂ and ethyl alcohol in the absence of oxygen.
| S.No. | Aerobic Respiration | S.No. | Anaerobic Respiration |
| 1. | It occurs in the presence of oxygen | 1. | It occurs in the absence of oxygen |
| 2. | Glucose is oxidised completely | 2. | Glucose is oxidised incompletely |
| 3. | End products are CO2, water and energy | 3. | End products are ethyl alcohol and CO2 and energy |
| 4. |
More energy is produced (38 ATP from
one gram mole of glucose) |
4. |
Very little energy is produced (2 ATP from
one gram mole of glucose) |
| 5. | Occurs in most of the plants and animals | 5. |
Occurs in few organisms like yeast,
bacteria and some parasitic worms. |
Respiration in Humans
Human respiratory tract involves the following:
- External nostrils: First part of respiratory system. It opens into nasal cavity and is meant for inhalation of air from outside.
- Nasal cavity: This cavity is separated from oral cavity by means of a hard and bony palate. It is lined by ciliated columnar epithelial cells that are rich in mucus, it brings about warmth, moistening and sterilization of air It contains hair and mucus which entrap the dust particles. Nasal cavity opens into it and it leads to pharynx.
Do solve questions given in the NCERT text book with the help of NCERT solutions for class 7 Science . If any students need to take the online test to check their concepts or undertstanding then they can visit Quiz for Respiration .
Find Below Short Notes of chapter-Respiration in Organisms
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