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(i) Moist to dissolve respiratory gases prior to diffusion;
(ii) Thin to reduce the distance through which diffusion has to take place/to facilitate rapid diffusion;
marto answered the question on October 4, 2019 at 10:34
- Describe the path taken by oxygen gas from atmosphere to the tissues of an insect.(Solved)
Describe the path taken by oxygen gas from atmosphere to the tissues of an insect.
Date posted: October 4, 2019. Answers (1)
- a)State two ways in which the surface area of the fish filaments is increased for efficient gaseous exchange.
b)What is the importance of counter flow system...(Solved)
a)State two ways in which the surface area of the fish filaments is increased for efficient gaseous exchange.
b)What is the importance of counter flow system in the filaments of a fish.
Date posted: October 4, 2019. Answers (1)
- State two ways in which bodies of people living in high altitude areas respond to low oxygen concentration(Solved)
State two ways in which bodies of people living in high altitude areas respond to low oxygen concentration
Date posted: October 4, 2019. Answers (1)
- Describe the changes that occur to the rib cage and the diaphragm during inspiration.(Solved)
Describe the changes that occur to the rib cage and the diaphragm during inspiration.
Date posted: October 4, 2019. Answers (1)
- Identify the surfaces of gaseous exchange in the following:-
(i) Paramecium;
(ii) Roots;
(iii) Frog;(Solved)
Identify the surfaces of gaseous exchange in the following:-
(i) Paramecium;
(ii) Roots;
(iii) Frog;
Date posted: October 4, 2019. Answers (1)
- Calculate the RQ of the food substance shown by the equation below.(Solved)
Calculate the RQ of the food substance shown by the equation below.
ii)Name the food substance being oxidized in (i) above.
iii)What is Respiration Quotient (RQ)?
Date posted: October 4, 2019. Answers (1)
- State two causes of coronary thrombosis.(Solved)
State two causes of coronary thrombosis.
Date posted: October 4, 2019. Answers (1)
- The amount of blood flow through various parts of the body of a mammal was measured in cm3 per minute at rest and during different...(Solved)
The amount of blood flow through various parts of the body of a mammal was measured in cm3 per minute at rest and during different physical activities. Results are shown below.
a) Calculate the percentage change in blood flow through the skeletal muscles and gut when the mammal was exposed to strenuous exercise.
i) Skeletal muscles
ii) Gut
b) Account for the differences in amount of blood flow through the gut and skeletal muscles;
i) At rest
ii) During streneous exercise
c) Account for the result obtained for the skin during light exercise
d) Name two substances which are removed from the body by the kidney
Date posted: October 4, 2019. Answers (1)
- The figure below represents a diagram of a photometer;(Solved)
The figure below represents a diagram of a photometer;
(a) What is the photometer used for ?
(b) State the precautions which should be taken when setting up a photometer
(c) Explain what you will expect if set up was placed under the following environmental conditions;
(i) Dark room
(ii) Leafy shoot enclosed in polythene bag
(iii) In a current of air created by a fan
Date posted: October 4, 2019. Answers (1)
- The flow chart below shows a blood transfusion pathway.(Solved)
The flow chart below shows a blood transfusion pathway.
(a) What three conclusions can you draw from the flow chart?
(b) State two precautions that must be observed during blood transfusion
(c) Explain how blood clot is formed once a blood vessels is injured
Date posted: October 4, 2019. Answers (1)
- Outline the route taken by a molecule of glucose from the ileum up to the kidney.(Solved)
Outline the route taken by a molecule of glucose from the ileum up to the kidney.
Date posted: October 4, 2019. Answers (1)
- (a) Why are xylem vessels more efficient in the transport of water than tracheids?
(b) What is the significance of xylem vessels being dead?(Solved)
(a) Why are xylem vessels more efficient in the transport of water than tracheids?
(b) What is the significance of xylem vessels being dead?
Date posted: October 4, 2019. Answers (1)
- The diagrams below show stages in the process of feeding shown by amoeba(Solved)
The diagrams below show stages in the process of feeding shown by amoeba
(a) Name the part labeled A.
(b) Name the process illustrated in the diagram above.
(d) Name the type of cell in human beings that exhibit this process
Date posted: October 4, 2019. Answers (1)
- A transfusion of RH+ blood was given to a patient with Rh- blood. After one week a similar transfusion was given to the same patient....(Solved)
A transfusion of RH+ blood was given to a patient with Rh- blood. After one week a similar transfusion was given to the same patient. What was likely to be the effect of the second transfusion?
Date posted: October 4, 2019. Answers (1)
- The diagram shows a section through a plant organ.(Solved)
The diagram shows a section through a plant organ.
(a)
(i) Name the class of the plant from which the section was obtained belong.
(ii) Give a reason for your answer in (a)(i) above
(b) How is the part labelled C adapted to its functions?
Date posted: October 4, 2019. Answers (1)
- The diagram below shows a part of a circulatory system. The arrows indicate the direction of the flow of blood.(Solved)
The diagram below shows a part of a circulatory system. The arrows indicate the direction of the flow of blood.
(a) Identify the blood vessels labeled A and B.
(b) Explain why it is important to transport food substances to organ C before being released for circulation to the rest of the body.
Date posted: October 4, 2019. Answers (1)
- The diagrams below show two conducting elements of the xylem tissue.(Solved)
The diagrams below show two conducting elements of the xylem tissue.
a) Identify each of them A and B
b) What makes the cellulose side walls of both A and B able to prevent collapsing?
Date posted: October 4, 2019. Answers (1)
- Laboratory analysis of a patient’s urine revealed the following concentration of various substances.(Solved)
Laboratory analysis of a patient’s urine revealed the following concentration of various substances.
a) From the analysis above, which disease is the patient suffering from
b) Name two symptoms of the disease in (a) above
Date posted: October 4, 2019. Answers (1)
- Identify two forces that help in upward movement of water in plants.(Solved)
Identify two forces that help in upward movement of water in plants.
Date posted: October 4, 2019. Answers (1)
- An experiment was set-up as shown below to investigate a certain plant process.(Solved)
An experiment was set-up as shown below to investigate a certain plant process.
(a) What process was being investigated above?
(b) What observation was made if;
(i) The experiment was left in strong wind for one hour?
(ii) All the leaves were removed from the plant?
Date posted: October 4, 2019. Answers (1)