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Questions and Answers
Why does an athlete breathe faster and deeper than usual after finishing a race?
What is a similarity between aerobic and anaerobic respiration?
Why do we often sneeze when inhaling a lot of dust-laden air?
In which test-tube would there be the highest concentration of CO2?
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What happens when anaerobic respiration takes place in muscle cells during high energy demand?
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What is the primary purpose of placing a snail and a plant together in a test-tube?
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What is the primary reason why mountaineers carry oxygen with them?
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During exhalation, what do the ribs primarily do?
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What causes cramps in the legs during heavy exercise?
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What are the tiny pores on the surface of a leaf called?
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Which of the following is NOT a respiratory organ in humans?
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Study Notes
Athlete Breathing Post-Race
- Athletes experience faster and deeper breathing after a race due to the body's demand for oxygen to replenish energy and remove carbon dioxide buildup.
Similarity in Respiration
- Both aerobic and anaerobic respiration produce energy, although aerobic requires oxygen while anaerobic does not.
Sneezing and Dust
- Sneezing occurs in response to inhaling dust-laden air as a protective reflex to expel irritants and clear the respiratory tract.
Test-Tube CO2 Concentration
- The test-tube with the highest concentration of CO2 is typically where anaerobic respiration is occurring, such as in yeast or muscle cells.
Anaerobic Respiration in Muscles
- During high energy demand, anaerobic respiration in muscle cells leads to lactic acid production, which can contribute to fatigue and cramps.
Snail and Plant Test-Tube Purpose
- Placing a snail and a plant together in a test-tube allows for the study of gas exchange; plants produce oxygen through photosynthesis while snails respire and release CO2.
Oxygen for Mountaineers
- Mountaineers carry oxygen due to reduced atmospheric oxygen levels at high altitudes, which can lead to hypoxia and difficulty in breathing.
Ribs During Exhalation
- During exhalation, the ribs primarily move downward and inward, aiding in the reduction of lung volume and expelling air.
Cramps During Heavy Exercise
- Cramps in the legs during heavy exercise are often caused by lactic acid accumulation and muscle fatigue due to prolonged activity.
Pores on Leaf Surface
- The tiny pores on the surface of a leaf are called stomata, which facilitate gas exchange for photosynthesis and respiration.
Non-Respiratory Organ
- The heart is NOT a respiratory organ in humans, as it primarily circulates blood rather than facilitating gas exchange.
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Description
Test your understanding of Chapter 10 on Respiration in Animals and Plants from Class 7 Science NCERT book. Questions cover topics like why athletes breathe faster after a race, anaerobic respiration, and energy production in muscle cells.
