Expiration
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Respiration is the phenomenon opposite to photosynthesis. Explain.
Which of the following statements is wrong?
The partial pressure of O2 is higher in the air inside the lungs than in the arterial blood.
The partial pressure of O2 is lower inside the venous blood than in the air in the lungs.
The partial pressure of CO2 is higher inside the venous blood than in the air inside the lungs.
The partial pressure of CO2 is higher in the air inside the lungs than inside the venous blood.
Name the three inlets of oxygen for respiration in plants.
Which of the following does not happen during expiration?
Diaphragm becomes convex
Volume of the thoracic cavity decreases
Diaphragm becomes concave
Muscular diaphragm relaxes
- expiration
- inhalation
- diffusion
Under which conditions do plants give different gases during respiration?
What happens when we exhale (breath out)?
The diaphragm contracts and moves upwards
The diaphragm relaxes and moves upwards
The diaphragm relaxes and moves downwards
None of these
- Flattened
- Relaxed
- Straightened
- Arched/Dome-shaped
- True
- False
When do plants respire?
Day
Night
All of the time
None of these
“All plants give out oxygen during day and carbon dioxide during night ”. Do you agree with this statement? Give reason.
- Vertebrae
- Sternum
- Diaphragm
- Liver
- True
- False
- During inhalation diaphragm moves downwards.
- During exhalation lungs reduce in size.
- During inhalation and exhalation, rib cage does not move.
- During inhalation and exhalation, windpipe does not move.
Atmospheric air / % | Exhaled air /% | |
A | 78 | 21 |
B | 21 | 16 |
C | 16 | 4 |
D | 4 | 0.04 |
Write any two differences between respiration and photosynthesis.
- The space in chest cavity decreases
- Diaphragm goes up
- Air is released
- Ribs are pushed upward and outward
does inhalation take place when the diaphragm contracts or relaxes??
- During expiration, pO2 of expired air is more than alveolar air but less than atmospheric air
- The partial pressure of O2 and CO2$ in the systemic veins is same as that in pulomonary vein.
- During expiration, pO2 of expired air is less than pCO2 of alveolar air but more than pCO2 of atmospheric air
- Sum of partial pressure of all gases at sea level is 760mmHg
- Inhalation
- Inspiration
- Expiration
- All of the above
- Taking air in
- Inhalation
- Releasing CO2
- Giving air out
- Relaxation of diaphragm and intercostal muscles
- Contraction of diaphragm and intercostal muscles
- Contraction of diaphragm muscles
- Contraction of intercostal muscles
- Sodium Chloride solution
- Calcium Carbonate solution
- Potassium Permanganate solution
- Potassium Bicarbonate solution
What happens when we exhale (breath out)?
The diaphragm contracts and moves upwards
None of these
The diaphragm relaxes and moves upwards
The diaphragm relaxes and moves downwards