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Why does an athlete breathe faster and deeper than usual after finishing the race?
Anathlete needs to supply extra energy to his muscle cells which have worked hard during running. For this, he breathes faster and deeper so that more oxygen is supplied to the cells. This speeds up the breakdown of food and as a result, more energy is released.
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List the similarities and differences between aerobic and anaerobic respiration.
Similarity between aerobic and anaerobic respiration:
In both aerobic and anaerobic respiration, the food is broken down to release energy.
Differences between aerobic and anaerobic respiration:
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Aerobic respiration |
Anaerobic respiration |
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It is the process of breakdown of food in the presence of oxygen. |
It is the process of breakdown of food in the absence of oxygen. |
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Its end products are CO2 and H2O. |
End products of anaerobic respiration can be lactic acid or CO2 and alcohol. |
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It takes longer time to release energy. |
It is a fast process as compared to aerobic respiration. |
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It produces large amount of energy. |
It produces small amount of energy as compared to aerobic respiration. |
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Examples: It occurs in most plants and animals. |
Examples: Yeast, bacteria, human muscle cells, etc. respire anaerobically. |
Why do we often sneeze when we inhale a lot of dust-laden air?
Sneezing expels the foreign particles from the inhaled air, so that only clean air enters our body. It usually occurs because of the irritation in the upper breathing passage. This irritation happens when we inhale some unwanted particles and they get trapped in our nasal cavity. Smoke, dust, pollen, etc. are some of the unwanted particles that may cause sneezing.
Take three test-tubes. Fill 3/4th of each with water. Label them A, B and C. Keep a snail in test-tube A, a water plant in test-tube B and in C, keep snail and plant both. Which test-tube would have the highest concentration of CO2?
Test tube A will have the highest concentration of CO2. This is because test tube A contains snail. Snail is an organism that breathes in O2 and breathes out CO2. Hence, CO2 concentration increases in test tube A.
Test tube B contains a water plant, which takes in CO2 for food synthesis and gives out O2. Hence, more O2 concentration is found in test tube B.
Test tube C contains both a snail and a plant. The CO2 produced by the snail is utilized by the plant for its food synthesis and the O2 released by the plant is utilized by the snail for respiration.
Therefore, test tube A has the highest concentration of CO2
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Mock Test Series
