WorksheetsGaseous Exchange and Its Control
Total questions: 15
Worksheet time: 11mins
Which of the following is not true about the structure of haemoglobin?
Each haemoglobin molecule contains four haem group
Haemoglobin has a quaternary level protein structure
Each iron ion in the haemoglobin can bind with maximum four oxygen molecules
Haemoglobin consists of two α chains and two β chains, held together by hydrogen bond
Most of the carbon dioxide produced by respiring tissues is transported to the lungs in which form?
Carbonic acid
Carbaminohaemoglobin
Bicarbonate ion
Dissolved carbon dioxide in blood plasma
Oxyhaemoglobin will give up its oxygen when
The concentration of carbon dioxide is high
pH value is high
The concentration of oxygen is high
Body temperature is low
Bohr shift occurs in the region of
Increase in partial pressure of oxygen
Increase in pH value
Increase in partial pressure of carbon dioxide
Decrease in partial pressure of 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 chemoreceptors are responsible in detecting pH changes of blood in the heart?
Carotid bodies
Medulla oblongata
Pons
Aortic bodies
Which of the following is not the characteristics of haemoglobin?
Has high affinity towards oxygen
Easily releases oxygen when the partial pressure of oxygen is low
Shows allosteric cooperatively binding characteristic
Carbon dioxide can also bind to haem group of haemoglobin
Which of the following is not true about myoglobin?
Myoglobin is respiratory pigment found in skeletal muscles of mammal
It consists of only one polypeptide chain, with one haem group
It is mainly use to transport oxygen and carbon dioxide
It has stronger affinity towards oxygen compared to haemoglobin
Which of the following does not occur during inhalation?
External intercostal muscles contracts
Diaphragm contracts
Ribcage relaxes
Lungs expand
Which of the following does not occur during exhalation?
External intercostal muscles relax
Diaphragm contracts
Ribcage relaxes
Elastic recoil of lungs
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 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
Carbonic anhydrase in erythrocytes catalyses which reaction?
Catalyses the increase in hydrogen ion concentration
Catalyses the formation of carbonic acid from carbon dioxide and water
Catalyses the conversion of carbon dioxide into water
Catalyses chloride shift to maintain the electrochemical gradient
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 is the competitive inhibitor that binds to haemoglobin?
Carbon dioxide
Hydrogen ion
Carbon monoxide
Bicarbonate ion
