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WorksheetsGasseous exchange
Total questions: 30
Worksheet time: 47mins
Most of the carbon dioxide produced by the body tissue is transported to the lungs in the form of …
Carbonic acid.
Blood plasma.
Bicarbonate ion.
Carbaminohaemoglobin.
In the chloride shift, ________________ move into the erythrocyte to replace the ______________ that move out.
Chloride ions; carbon dioxide molecules.
Carbon dioxide molecules; chloride ions.
Bicarbonate ions; chloride ions.
Chloride ions; bicarbonate ions.
Oxyhaemoglobin gives up O2 when …
CO2 concentrations are high.
Body temperature is lowered.
pH values are high.
O2 concentrations are higher.
The Bohr shift occurs in region of …
Increased partial pressure of oxygen.
Decreased partial pressure of oxygen.
Increased partial pressure of carbon dioxide.
Decreased partial pressure of carbon dioxide.
The acidity due to the accumulation of H+ in erythrocytes is buffered by …
Haemoglobin.
Plasma proteins.
Carbon dioxide.
Oxygen.
Carbonic anhydrase in the erythrocytes …
Catalyzes the removal of oxygen from the erythrocytes.
Catalyzes the conversion of carbon dioxide into water.
Catalyzes the reaction of carbon dioxide with water to form carbonic acid.
Catalyzes the increase in blood pH.
Each haemoglobin molecule can bind reversibly with
one atom of oxygen
one molecule of oxygen
two molecules of oxygen
four molecules of oxygen
which of the following explains the meaning of the Bohr effect?
The effect of the partial pressure of oxygen in blood on the affinity of haemoglobin towards carbon dioxide.
The effect of the partial pressure of carbon dioxide on the dissociation of oxyhaemoglobin.
The affinity of haemoglobin toward oxygen.
The affinity of haemoglobin towards carbon dioxide.
When chemoreceptors detect a slight decrease in pH, this means that concentration of __________ has increased, and the breathing rate must __________.
Carbon dioxide; increase
Carbon dioxide; decrease
Oxygen; increase
Oxygen; decrease
Which of the following leads to stomatal closing?
Water will flow out from guard cells into subsidiary cells
Guard cells become turgid
Phosphorylase catalyses the conversion of starch into glucose-1-phosphate
pH value increases
Which of the following leads to stomatal opening?
Low concentration of carbon dioxide in guard cells
Drop in pH value
Phosphorylase catalyse the conversion of glucose-1-phosphate into starch
Water potential in guard cells increase
Respiring cells need a continuous supply of
(a)
Gaseous exchange in humans takes place in the
(a)
Blood rich in _____________ flows to the body cells. Blood rich in __________ flows to the lungs.
(a)
Name part marked A.
Stomata
Nucleus
Stoma
Epidermal cell
Structure of hemoglobin :
conjugated protein
tertiary structure
consist of 4 subunits of polypeptide bond
consist of 4 subunits of polynucleotide
Why hemoglobin can react as respiratory pigment?
high affinity toward CO2
high affinity to O2
can easily release O2 when Po2 is low at lung
can easily release O2 when Po2 is low at tissue
How many oxygen gas combine with hemoglobin?
(a)
what happen to oxygen dissociation curve (ODC) if Pco2 increase at tissue?
(a)
what happen to the oxygen dissociation curve (ODC) if Po2 increase at lung?
(a)
what happen to the hemoglobin when Po2 increase at lung?
affinity to oxygen high
forming oxyhemoglobin
release oxygen
affinity to oxygen low
Oxyhaemoglobin gives up O2 when …
CO2 concentrations are high.
Body temperature is lowered.
pH values are high.
O2 concentrations are higher.
Each haemoglobin molecule can bind reversibly with
one atom of oxygen
one molecule of oxygen
two molecules of oxygen
four molecules of oxygen
state two function of stoma
regulate gaseous exchange
regulate water loss
regulate the uptake of water
regulate pH of plant
The opening and closing of stomata is controlled by
The presence of light
The osmotic pressure and turgidity of guard cells
The accumulation of solutes in guard cells
Partial pressure of oxygen and carbon dioxide
Which of the following statements is NOT TRUE?
Haemoglobin act as buffer
Haemoglobin binds loosely and reversibly to oxygen
Haemoglobin consist of four polypeptide chain
Haemoglobin can only bind with two molecules of oxygen
Which of the following is FALSE concerning the haemoglobin molecule?
It contains amino acids.
It contains iron.
It is composed of four polypeptide chains.
It is found in humans only.
Plan taking in oxygen and giving out Carbon dioxide
During the day
During the night
The chloride shift in the blood is the movement of
Chloride ions into the alveolar space
Chloride ions into tissue cells to maintain the electrochemical neutrality
Chloride ions into erythrocyte to balance the bicarbonate ions that move into the cell
Chloride ions into erythrocyte to maintain the electrochemical neutrality
Which of the following is the primary enzyme that involved in the transport of carbon dioxide in blood?
Synthetase
Carbonic anhydrase
Dehydrogenase
Decarboxylase
