By heating the leaf in an oven at 1100C and weighing it ; then heating and weighing it several times ; till a constant weight is obtained ;
sharon kalunda answered the question on May 29, 2019 at 11:10
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Explain why a green leaf is normally tested for the presence of starch instead of glucose.
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Explain why a green leaf is normally tested for the presence of starch instead of glucose.
Date posted:
May 29, 2019
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Answers (1)
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In a physiological experiment, starch, protein, diastase and sodium chloride (common salt) were added
to water and put inside a visking tubing. The visking tubing was...
(Solved)
In a physiological experiment, starch, protein, diastase and sodium chloride (common salt) were added
to water and put inside a visking tubing. The visking tubing was then placed in a water bath maintained at a temperature between 350C and 400C. The set-up was as shown in the diagram below.
The following observations were made after the procedures indicated.
(a) Name the process by which salt moved into the water in the beaker from the visking tubing.
(b) (i) Name the food substance responsible for the brown colour observed after one hour both in the beaker and visking tubing when solutions were boiled with Benedict’s solution.
(ii) Account for the observation in b(i) above.
(c) (i) Name the food substance tested with sodium hydroxide followed by copper sulphate solutions.
(ii) Account for the absence of the food substance named in c(i) above in the beaker after1 hour.
(d) After one hour, the visking tubing was firm. State the term used to describe this state.
Date posted:
May 29, 2019
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Answers (1)
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The diagram below represents a section through the mammalian ear. Study it and answer the questions that follow.
(a) Name the structures labelled H and J....
(Solved)
The diagram below represents a section through the mammalian ear. Study it and answer the questions that follow.
(a) Name the structures labelled H and J.
(b) State how the structures labelled H, M and N are adapted to their functions. H,M,N.
(c) State what would happen if the structure labelled K was completely damaged?.
(d) Name the fluid contained in structure N.
(e) Apart from hearing, state the other role performed by the human ear.
Date posted:
May 29, 2019
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Answers (1)
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The figure below shows a germinating seedling.
(a) Name the parts labelled. A,B C
(b) Give three important environmental conditions that are necessary for seed germination...
(Solved)
The figure below shows a germinating seedling.
(a) Name the parts labelled. A,B C
(b) Give three important environmental conditions that are necessary for seed germination and state why they are important.
(c) The part labelled D was removed from the above seedling three months later. After a few days the plant became bushy with several lateral branches.
(i) What is this phenomenon called?
(ii) Why did the removal of the stem tip result in a shorter plant with bushy growth?
Date posted:
May 29, 2019
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Answers (1)
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The diagram below shows part of a food relationship in an ecosystem.
(a) Name the food relationship above.
(b) How many trophic levels are shown in...
(Solved)
The diagram below shows part of a food relationship in an ecosystem.
(a) Name the food relationship above.
(b) How many trophic levels are shown in the diagram above.
(c) Name one primary consumer in the food relationship above.
(d) State the main source of energy in the ecosystem.
Date posted:
May 29, 2019
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Answers (1)
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Explain the absence of fibrinogen in urine yet it is present in blood plasma.
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Explain the absence of fibrinogen in urine yet it is present in blood plasma.
Date posted:
May 29, 2019
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Answers (1)
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When corpus luteum breaks down prematurely during pregnancy, miscarriage is likely to result. Explain.
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When corpus luteum breaks down prematurely during pregnancy, miscarriage is likely to result. Explain.
Date posted:
May 29, 2019
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Answers (1)
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Name one region in higher plants where cells actively undergo mitosis.
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Name one region in higher plants where cells actively undergo mitosis.
Date posted:
May 29, 2019
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Answers (1)
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What name is given to a cell that contains one member of each pair of chromosomes?
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What name is given to a cell that contains one member of each pair of chromosomes?
Date posted:
May 29, 2019
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Answers (1)
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In the body cells of all organisms chromosomes occur in pairs. Members of each pair have a characteristic length and shape.What is the scientific name...
(Solved)
In the body cells of all organisms chromosomes occur in pairs. Members of each pair have a characteristic length and shape.What is the scientific name of such chromosome pair?.
Date posted:
May 29, 2019
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Answers (1)
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The graph below shows the relationship between environmental temperature and the body temperature in two different animals A and B.
(a) State the relationship between the...
(Solved)
The graph below shows the relationship between environmental temperature and the body temperature in two different animals A and B.
(a) State the relationship between the body temperature of animal A and external environmental temperature.
(b) Give the term used to describe;
(i) Animals of type shown by graph A.
(ii) Animals of type represented by graph B.
Date posted:
May 29, 2019
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Answers (1)
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The table below shows the energy use per day in kilojoule.
(a) From the table, explain why after age 8 males require more energy than females....
(Solved)
The table below shows the energy use per day in kilojoule.
(a) From the table, explain why after age 8 males require more energy than females.
(b) Other than sex and age, name three other factors that determine energy requirements in human being.
Date posted:
May 29, 2019
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Answers (1)
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State the name given to the Study of chemical compounds and the reaction they take part in.
(Solved)
State the name given to the Study of chemical compounds and the reaction they take part in.
Date posted:
May 29, 2019
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Answers (1)
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Below is a diagrammatic summary of the main biochemical events in photosynthesis. Study it carefully and answer the questions that follow.(a) Suggest the identity of molecule...
(Solved)
Below is a diagrammatic summary of the main biochemical events in photosynthesis. Study it
carefully and answer the questions that follow.
(a) Suggest the identity of molecule P.
(b) Name the gas represented by letter W.
(c) Name the specific site for the reactions in stage A.
(d) Name reaction Z.
Date posted:
May 29, 2019
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Answers (1)
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Name the disease caused by the following parasite Entamoeba histolytica.
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Name the disease caused by the following parasite Entamoeba histolytica.
Date posted:
May 29, 2019
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Answers (1)
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Name the disease caused by the following parasite Salmonella typhi.
(Solved)
Name the disease caused by the following parasite Salmonella typhi.
Date posted:
May 29, 2019
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Answers (1)
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The percentage germination of certain seeds at different temperature was determined as follows.
a) Using a suitable scale plot a graph of % germination against temperature
b)...
(Solved)
The percentage germination of certain seeds at different temperature was determined as follows.
a) Using a suitable scale plot a graph of % germination against temperature
b) ccount for % germination at
i) 0°C
ii) 30°C
iii) 50°C
Date posted:
May 29, 2019
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Answers (1)
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State the factors that determine seed viability.
(Solved)
State the factors that determine seed viability.
Date posted:
May 29, 2019
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Answers (1)
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An experiment was set up to study the response of woodlice to light. Ten woodlice were placed in a glass tube. After five minutes
one end...
(Solved)
An experiment was set up to study the response of woodlice to light. Ten woodlice were placed in a glass tube. After five minutesone end of the tube was covered with black paper to make it dark. The number of woodlice in light and dark was then recorded every minute for five minutes.The diagram below shows the apparatus used.
The table below shows the results of the experiment.
i) Why were the woodlice left there for five minutes before the pack paper was placed on the tube?
ii) Complete the line graph on the grid below to show the number of woodlice found in the dark at each minute during the
experiment. The results for woodlice in light have already been plotted.
iii) State a conclusion which can be drawn from the results of this experiment.
c) A student repeated this experiment.
i) How could the design be changed to make the results more reliable?
ii) State one environmental factor which would be kept the same to allow a valid comparison with the first experiment.
Date posted:
May 29, 2019
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Answers (1)
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In an investigation, young plant shoots were exposed to 48hrs of light from above or from one side only. Their growth responses are shown in...
(Solved)
In an investigation, young plant shoots were exposed to 48hrs of light from above or from one side only. Their growth responses are shown in the diagrams below.
i) Name the response shown by the shoots and explain the advantages of this response to the plants.
ii) Account for the growth response of shoot B after 48 hours.
Date posted:
May 29, 2019
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Answers (1)