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WorksheetsGas Exchange
Total questions: 15
Worksheet time: 30mins
The following graph shows four oxygen dissociation curves for respiratory pigments. Which curve represents the oxygen dissociation curve for myoglobin?
A
B
C
D
What is the function of chloride shift?
To balance the pH level in erythrocyte
To balance the electrochemical charges in erythrocyte
To balance the carbon dioxide concentration in cells
To bind with H+ ions forming hydrochloric acid
The following drawing shows a portion of the under surface of a leaf at two different times of day. In this drawing, the arrows indicated by
label V, point to non-respiring cells.
label W, point to photosynthetic cells
label X, show the direction of movement of potassium ions
label Y, show the direction of movement of starch molecules.
In Bohr’s effect, the affinity of hemoglobin towards oxygen is reduced because
The shape of hemoglobin is altered by high concentration of CO2
Hemoglobin acts as a pH buffer in erythrocytes
Ferum ion in haemoglobin is attracted to chloride ions that diffuse in erythrocyes
The concentration of carbamino-hemoglobin increases in erythrocytes
The graph shows oxygen dissociation curves of fish and human. The oxygen dissociation curve of fish is to the right of human because
Fish haemoglobin has a higher affinity to oxygen
Oxygen concentration in water is lower than in air
At low oxygen partial pressure, human haemoglobin is more saturated than fish haemoglobin
At low oxygen partial pressure, fish haemoglobin binds to less oxygen compared to human haemoglobin
The diagram shows the oxygen dissociation curves of adult haemoglobin, foetal haemoglobin and myoglobin. Which of the following statements are true of the curves above?
I P is for myoglobin, Q is for foetal hemoglobin and R is for adult hemoglobin
II P is for foetal hemoglobin, Q is for adult hemoglobin and R is for myoglobin
III Based on affinity towards oxygen, P > Q > R
IV Based on ability to dissociate from oxygen at point T, P > Q > R
I and III
I and IV
II and III
II and IV
Which of the following is true of the opening and closing mechanism of stomata?
When concentration of carbon dioxide reduces, potassium ions diffuse into the guard cells and stomata opens
When concentration of carbon dioxide reduces, potassium ions diffuse into the guard cells and stomata closes
When there is water deficiency, abscisic acid is secreted and stomata opens
When water content in the guard cell increases, abscisic acid is secreted and stomata closes
The opening of the stoma involves
The increase of osmotic concentration in the guard cell
The decrease of turgor pressure in the guard cell
The sugar diffusion out of the guard cell
The transportation of the active ion K+ out of the guard cell.
Which of the following explains Bohr effect?
The regulating of constant pH in blood
The haemoglobin affinity towards carbon dioxide
The influence of carbon dioxide concentration on the dissociation of oxyhaemoglobin
The increase in dissociation rate of carbon dioxide due to the influence of ferum ions
The graph is showing an oxygen dissociation curve. Choose the correct statement from the following based on the graph.
Decrease in the blood pH shifts the graph to the right showing haemoglobin's affinity towards oxygen has reduced.
Increase in the blood pH shifts the graph to the right showing haemoglobin's affinity towards oxygen has increased.
Increase in release of oxygen from haemoglobin shifts the graph to the left
Decrease in the blood pH shifts the graph to the left showing that the affinity of haemoglobin towards oxygen has increased
Why is myoglobin found in large quantities in depressor as well a elevator muscles in flying animals ?
To supply energy that is needed while flying
Because myoglobin molecules are smaller than haemoglobin molecules
To supply oxygen to the muscular tissues when the animals fly in an area with very low oxygen pressure
Because compared with haemoglobin, myoglobin is able to absorb the oxygen from those muscles more actively
The breathing control mechanism is shown in the schematic diagram below. Which is true about X and Y?
X= Blood pH decreases; Y= Cerebrospinal fluid pH decreases
X= Blood pH decreases; Y= Cerebrospinal fluid pH increases
X= Blood pH increases; Y= Cerebrospinal fluid pH decreases
X= Blood pH increases; Y= Cerebrospinal fluid pH increases
Which situations would promote the opening of stomata of Hibiscus rosa-sinensis?
I The plants are supplied with sufficient water
II The roots are supplied with fertilizers rich in potassium ions
III The leaves are exposed to blue light
IV The plants are exposed to high concentrations of abscisic acid.
I and II
I and III
II and IV
III and IV
Which is true about hemoglobin when blood pH increases from 7.2 to 7.4?
The release of oxygen increases
The partial pressure of carbon dioxide increases
The affinity of hemoglobin towards oxygen increases
The ability of hemoglobin to bind the hydrogen ions increases
The main function of cilia which line the respiratory surface is to
Moisten the trachea
Lubricate the bronchi to ease the flow of air into the lungs
Move the mucus to the pharynx and away from the lungs
Provide mucus to the lungs to prevent the lungs from dehydration
