(i) To reduce the thickness of the epithelial lining making tracheoles permeable to respiratory gases reduces the distance to be covered by respiratory gases increasing rate of diffusion.
(ii) For efficient gases exchange muscular contraction of the floor of the mouth increases the volume and decrease the pressure in the mouth cavity forcing water to rush into mouth
johnmulu answered the question on May 4, 2017 at 05:58
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The diagram below shows the gaseous exchange system of a locust.
(Solved)
The diagram below shows the gaseous exchange system of a locust.
(a) Name the structure labelled Q.
(b) State the function of the part labeled R.
(c) How is the part labeled S structurally adapted tom its function?
Date posted:
May 4, 2017
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Answers (1)
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The diagram below represents a model used to demonstrate breathing in mammals.
(Solved)
The diagram below represents a model used to demonstrate breathing in mammals.
(a) Name the mammalian structure represented by the parts labeled D and E.
(i) D (ii) E
(b) State the observation made when the string is pulled downwards
(c) Explain the observation in (b) above
Date posted:
May 4, 2017
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Answers (1)
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How are lenticels adapted for gaseous exchange?
(Solved)
How are lenticels adapted for gaseous exchange?
Date posted:
May 4, 2017
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Answers (1)
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State the difference in content of oxygen and carbon (IV) oxide in the air that enters and leaves the human lungs
(Solved)
State the difference in content of oxygen and carbon (IV) oxide in the air that enters and leaves the human lungs
Date posted:
May 4, 2017
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Answers (1)
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a) Name two structures for gaseous exchange in aquatic plants (b) What is the effect of contraction of the diaphragm muscles during breathing in mammals?
(Solved)
a) Name two structures for gaseous exchange in aquatic plants
b) What is the effect of contraction of the diaphragm muscles during breathing in mammals?
Date posted:
May 3, 2017
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Answers (1)
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State four ways in which respiratory surfaces are suited to their function
(Solved)
State four ways in which respiratory surfaces are suited to their function
Date posted:
May 3, 2017
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Answers (1)
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State two ways in which floating leaves of aquatic plants are adapted to gaseous exchange.
(Solved)
State two ways in which floating leaves of aquatic plants are adapted to gaseous exchange.
Date posted:
May 3, 2017
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Answers (1)
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The diagram below represents a part of the rib cage.
(Solved)
The diagram below represents a part of the rib cage.
(a) Name the parts labeled W, Y and Z.
b) How does the part labeled Z facilitate breathing in?
Date posted:
May 3, 2017
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Answers (1)
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Name three sites where gaseous exchange take place in terrestrial plants.
(Solved)
Name three sites where gaseous exchange take place in terrestrial plants.
Date posted:
May 3, 2017
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Answers (1)
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Why are gills in fish highly vascularized
(Solved)
Why are gills in fish highly vascularized
Date posted:
May 3, 2017
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Answers (1)
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An individual is of blood group B positive.(a) Name the antigens in the individual's blood(b) Give the reason why the individual's cannot receive blood from a blood group A donor
(Solved)
An individual is of blood group B positive.
a) Name the antigens in the individual's blood
b) Give the reason why the individual's cannot receive blood from a blood group A donor
Date posted:
May 3, 2017
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Answers (1)
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The table provided shows the transportation of substances in the human body
(Solved)
The table provided shows the transportation of substances in the human body
Name the substances represented by M, N and P
Date posted:
May 3, 2017
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Answers (1)
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The diagram below shows blood circulation in a mammalian tissue.
(Solved)
The diagram below shows blood circulation in a mammalian tissue.
a) Name the part labeled P and Q.
b) Name the substances that are:
i) Required for respiration that move out of capillaries;
ii) Removed from tissue cells as a result of respiration
c) Name one component of the blood that is not found in the part labeled P.
Date posted:
May 3, 2017
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Answers (1)
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Explain three ways in which red blood cells are adapted to their function.
(Solved)
Red blood cells are adapted to their function. Explain three ways in which they are adapted to their function.
Date posted:
May 3, 2017
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Answers (1)
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Explain why it is not advisable to be in a poorly ventilated room with a burning charcoal stove
(Solved)
Explain why it is not advisable to be in a poorly ventilated room with a burning charcoal stove
Date posted:
May 3, 2017
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Answers (1)
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Why would carboxyhaemoglobin lead to death
(Solved)
Why would carboxyhaemoglobin lead to death
Date posted:
May 3, 2017
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Answers (1)
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The diagram below shows a vertical section through a mammalian heart.
(Solved)
The diagram below shows a vertical section through a mammalian heart.
a) Name the parts labeled A, B, E and F.
b) Give a reason why the wall of chamber C is thicker than chamber D
Date posted:
May 3, 2017
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Answers (1)
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a) How may excessive bleeding results in death?
b) Name the process by which the human body naturally stops bleeding?
c) How can low blood volume be brought back to normal?
(Solved)
a) How may excessive bleeding results in death?
b) Name the process by which the human body naturally stops bleeding?
c) How can low blood volume be brought back to normal?
Date posted:
May 3, 2017
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Answers (1)
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Describe the path taken by carbon dioxide released from the tissue of an insect to the atmosphere.
(Solved)
Describe the path taken by carbon dioxide released from the tissue of an insect to the atmosphere.
Date posted:
May 3, 2017
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Answers (1)
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The diagram below shows a transverse section of a plant organ.
(Solved)
The diagram below shows a transverse section of a plant organ.
a) Name the plant organ from which the section was obtained.
b) i) Name the class to which the plant organ was obtained.
ii) Give a reason for your answer in (b)(i) above
Date posted:
May 3, 2017
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Answers (1)