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Aerobic respiration occurs in adequate supply of air producing a lot of energy, carbon dioxide and |
water. |
Anaerobic respiration and fermentation occurs in inadequate supply or absence of oxygen to produce |
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energy. |
Cells may resort to the breakdown of 3 carbon compound, pyruvate, aerobically or anaerobically |
depending upon the availability of oxygen. Usually in multicellular organisms cells fail to carry on |
the process of anaerobic respiration for long. |
Respiration is not essentially a process of combustion differ due to following reasons |
- Glucose must be burnt at high temperature in the laboratory to liberate energy, if it happened in |
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our cells, all cells would be burnt. |
- Once glucose starts burning we can’t stop the process easily, but living cells are able to exercise |
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control over the sort of burning of glucose in the presence of oxygen. |
- Water normally stops combustion from taking place while cells contain a lot of water and |
respiration still goes on. |
Photosynthesis and respiration appear to be opposing reactions, but both have very different |
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biochemical pathways and are essential for a plant’s metabolism. |
Photosynthesis takes place in the chloroplast to produce sugars, starches and other carbohydrates |
for the plant’s metabolic needs. |
Cellular respiration occurs in mitochondria where mainly these carbohydrates are “burned” to |
produce chemical energy to do work at the cellular level. |
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44 X Class Respiration - The energy releasing system |
Improve your learning |
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A |
1. Distinguish between (AS1) |
a) inspiration and expiration b) aerobic and anaerobic respiration |
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AN |
c) respiration and combustion d) photosynthesis and respiration |
2. State two similarities between aerobic and anaerobic respiration.(AS1) |
3. Food sometimes enters the wind pipe and causes choking. How does it happen?(AS1) |
4. Why does the rate of breathing increase while walking uphill at a normal pace in the mountains? |
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NG |
Give two reasons.(AS1) |
5. Air leaves the tiny sacs in the lungs to pass into capillaries. What modification is needed in the |
statement?(AS1) |
6. Plants photosynthesize during daytime and respire during the night. Do you agree to this statement? |
Why? Why not?(AS1) |
LA |
7. Why does a deep sea diver and mountainair carry oxygen cylinder on her back?(AS1) |
8. How are alveoli designed to maximize the exchange of gases?(AS1) |
9. Where will the release of energy from glucose in respiration take place? Mala writes lungs while |
Raziya writes muscles. Who is correct and why?(AS1) |
10. What is the role of epiglottis and diaphragm in respiration?(AS1) |
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11. How does gaseous exchange takes place at blood level (or) cellular level?(AS1) |
12. Explain the mechanism of gaseous exchange at branchiole level.(AS1) |
13. After a vigorous excercise or work we feel pain in muscles. What is the relationship between pain |
and respiration?(AS1) |
14. Raju said stem also respire along with leaves in plants. Can you support this statement? Give your |
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reasons.(AS1) |
15. What happen if diaphragm is not there in the body?(AS2) |
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16. If you have a chance to meet pulmonologist what questions are you going to ask about pulmonory |
respiration?(AS2) |
17. What procedure do you follow to understand anaerobic respiration in your school laboratory?(AS3) |
18. What are your observations in combustion of sugar activity?(AS3) |
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