Master NEET Zoology with topic-wise questions. Tailored for NEET students, these questions strengthen your Biology preparation.
A flask containing a mixture of He and CH4 is maintained at STP. If the partial pressure of He is 0.4 atm, what is the mole fraction of CH4?
0.4
0.6
0.8
1.0
What is the driving force for the diffusion of gases across the respiratory membrane?
Temperature difference
Concentration difference
Partial pressure difference
Solubility difference
If the partial pressure of oxygen in the alveoli is 100 mmHg and the partial pressure of oxygen in the pulmonary artery is 40 mmHg, what drives the diffusion of oxygen into the blood?
Active transport of oxygen across the alveolar membrane.
Facilitated diffusion by hemoglobin.
The partial pressure difference between the alveoli and the pulmonary artery.
The higher concentration of oxygen in the alveoli compared to the pulmonary artery.
What causes oxygen to move from the alveoli into the blood?
Active transport by lung cells
Difference in partial pressure of oxygen
Movement of carbon dioxide out of the blood
Contraction of the heart
Which of the following statements is INCORRECT regarding oxygen transport in humans?
Hemoglobin's affinity for oxygen increases as the partial pressure of oxygen increases
Most oxygen is transported bound to hemoglobin
A small amount of oxygen is transported dissolved in plasma
Hemoglobin's affinity for oxygen increases as the partial pressure of carbon dioxide increases
Under which of the following conditions is haemoglobin MOST likely to release oxygen?
High pO2, low pCO2, low H+ concentration, low temperature
Low pO2, high pCO2, high H+ concentration, high temperature
High pO2, high pCO2, low H+ concentration, high temperature
Low pO2, low pCO2, high H+ concentration, low temperature
A significant decrease in the partial pressure of oxygen (pO2) in the blood will primarily lead to:
Increased binding of oxygen to haemoglobin
Increased release of oxygen from haemoglobin
No change in oxygen binding to haemoglobin
Increased transport of carbon dioxide
The partial pressure of oxygen in the alveoli is about four times the partial pressure of carbon dioxide. If the partial pressure of is mm Hg, and the total pressure of both gases in the alveoli is 144 mm Hg, what is the value of ?
28.8
32
36
24
If the total pressure in the alveoli is 760 mmHg and oxygen constitutes 13.7% of the alveolar air, what is the partial pressure of oxygen?
760 mmHg
160 mmHg
104 mmHg
40 mmHg
During oxygen transport, the oxyhaemoglobin at the tissue level liberates oxygen to the cells because
concentration is high and is low
concentration is low and is high
tension is low and tension is high
tension is high and tension is low
