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- 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)
- What is the destination of materials translocated in plants.(Solved)
What is the destination of materials translocated in plants.
Date posted: October 4, 2019. Answers (1)
- The diagram below shows a bone obtained from a mammal.(Solved)
The diagram below shows a bone obtained from a mammal.
(a) Name the part of the skeleton from which the bone has been taken.
(b) Label the parts B and C.
(c) State the functions of part A.
Date posted: October 4, 2019. Answers (1)
- Study the dental formula of an organism below.(Solved)
Study the dental formula of an organism below.
(a) (i) What is the total number of teeth this organism possess?
(ii) What is the mode of feeding of the organism?
(b) State two functions of mucus produced along the alimentary canal
Date posted: October 4, 2019. Answers (1)
- a)List three forces that facilitate the transport of water and mineral salts up the stem.
b)Name the tissue that is removed when the bark of a...(Solved)
a)List three forces that facilitate the transport of water and mineral salts up the stem.
b)Name the tissue that is removed when the bark of a dicotyledonous plant is ringed.
Date posted: October 4, 2019. Answers (1)
- The diagram below shows an experiment that was carried out to measure how fast a were plant such as Elodea photosynthesizes(Solved)
The diagram below shows an experiment that was carried out to measure how fast a were plant such as Elodea photosynthesizes
The shoot was exposed to different light intensities and the rate of photosynthesis estimated by counting the number of bubbles of gas leaving the shoot in a given time. the results are given below;
a) Plot these data on apiece of graph paper provided
b) At what light intensity did the shoot produce ;
i) 18 bubbles per minute
ii) 25 bubbles per minute
c) Give two better ways of measuring the rate of photosynthesis than counting bubbles
d) What is the role of light intensity in photosynthesis
e) Account for the expected results of doing this experience at the following temperature;
i) 4ºC
ii) 34ºC
iii) 60ºC
f) Other than light intensity and temperature, name other factors that affect the rate of
photosynthesis
Date posted: October 4, 2019. Answers (1)
- The table below shows the results of an experiment carried out to determine the rate of photosynthesis at different light intensities and varying Carbon (IV)...(Solved)
The table below shows the results of an experiment carried out to determine the rate of photosynthesis at different light intensities and varying Carbon (IV) oxide concentrations. The rate was determined by counting the number of bubbles per minute. The temperature was kept constant.
a) On a graph paper provided, draw a graph for each of the light intensities. All the three graphs should be plotted on the same axis (rate of photosynthesis on vertical axis and carbon (IV) oxide concentration on horizontal axis
b) What is the effect of an increase in carbon (IV) oxide concentrations and light intensities
c) Briefly explain how aquatic green plants meet light intensities and carbon (IV) oxide
requirement
d) Using the data provided in the table state two factors required by the green plants for food
production
Date posted: October 4, 2019. Answers (1)
- A student was culturing E. coli (a bacterium) in a Petri-dish. He placed the Petri-dish in an incubator at 30oC.He removed it from the incubator...(Solved)
A student was culturing E. coli (a bacterium) in a Petri-dish. He placed the Petri-dish in an incubator at 30oC.He removed it from the incubator the following day and found that five colonies of bacteria had grown. He decided to return it into the incubator to give it more time. When he removed it fourteen days later, he could not observe any colony.
a) Why was there no colony on the fourteenth day?
b) Explain how bacteria cause spoilage of stored food in warm moist conditions.
c) Name other organisms which also cause food spoilage.
d) State their economic importance to nature.
Date posted: October 4, 2019. Answers (1)