AO and BO
sharon kalunda answered the question on May 24, 2019 at 13:36
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An experiment was carried out to investigate haemolysis of human red blood cells. The red blood cells were placed in different concentration of sodium chloride...
(Solved)
An experiment was carried out to investigate haemolysis of human red blood cells. The red blood cells were placed in different concentration of sodium chloride solution. The percentage of haemolysed cells was determined. The results were as shown in the table below.
a) i) On the grid provided, plot a graph of haemolysed red blood cells against salt concentration.
ii)At what concentration of salt solution was the proportion of haemolysed cell equal to non-haemolysed cells?
iii) State the percentage of cells haemolysed at salt concentration of 0.45%.
b) Account for the results obtained at:
i) 0.33 percent salt concentration.
ii) 0.48 per cent salt concentration.
c) What would happen to the red blood cells if they were placed in 0.50 percent salt solution?
d) Explain what would happen to onion epidermal cells if they were placed in distilled water.
Date posted:
May 24, 2019
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Answers (1)
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The diagram below represents a food web in a certain ecosystem.
a) Name the trophic level occupied by each of the following:
i) Caterpillar .
ii) Small...
(Solved)
The diagram below represents a food web in a certain ecosystem.
a) Name the trophic level occupied by each of the following:
i) Caterpillar .
ii) Small insects .
b) From the food web, construct two food chains which end with lizards as tertiary consumer.
c) i) Which organisms have the least biomass in this ecosystem?
ii) Explain the answer in c(i) above.
Date posted:
May 24, 2019
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Answers (1)
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State two consequences of gene mutations.
(Solved)
State two consequences of gene mutations.
Date posted:
May 24, 2019
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Answers (1)
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Mwalimu Andrew of Mwisho wa Lami High school quarrels with his wife Fiolina over the identity of their child. Andrew
is heterozygous blood group A and...
(Solved)
Mwalimu Andrew of Mwisho wa Lami High school quarrels with his wife Fiolina over the identity of their child. Andrew
is heterozygous blood group A and Fiolina is homozygous blood group B. The child born is of blood group O. Andrew has
sued Fiolina for divorce over infidelity. Does Andrew have a chance of winning the case? Show your working.
Date posted:
May 24, 2019
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Answers (1)
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State the structural modification of nephron in the desert mammals.
(Solved)
State the structural modification of nephron in the desert mammals.
Date posted:
May 24, 2019
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Answers (1)
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Write the dental formula of an adult human
(Solved)
Write the dental formula of an adult human
Date posted:
May 24, 2019
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Answers (1)
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Name two functional parts of the mammalian circulatory system.
(Solved)
Name two functional parts of the mammalian circulatory system.
Date posted:
May 24, 2019
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Answers (1)
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Explain how the girdles are adapted to their functions.
(Solved)
Explain how the girdles are adapted to their functions.
Date posted:
May 24, 2019
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Answers (1)
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State three functions of the endoskeleton.
(Solved)
State three functions of the endoskeleton.
Date posted:
May 24, 2019
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Answers (1)
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An experiment was carried out to find out the concentrations of ions in the cell sap of an aquatic plant and that of the water...
(Solved)
An experiment was carried out to find out the concentrations of ions in the cell sap of an aquatic plant and that of the water in the pond in which they grew.
a) i) Name the process by which the aquatic plant absorbs ions from the pond water.
ii) Outline four roles of the process you have named in (a) (i) above in a mammalian body.
b) How can the rate of uptake of ions by aquatic plants be increased.
c) Name the part of the cell that allows passage of ions in and out of the cell.
Date posted:
May 24, 2019
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Answers (1)
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The diagram below represents growing seedling which were subjected to unilateral light at the beginning of an experiment.
a) i) State the result of P and...
(Solved)
The diagram below represents growing seedling which were subjected to unilateral light at the beginning of an experiment.
a) i) State the result of P and R.
ii) Account for your answer in (a) (i) above.
b) (i) If the apical bud of seedling P was removed, what results would be expected after 5 days.
ii) Explain your observation in (b) (i) above.
c) What is the significance of the practice in b (i) above in agriculture?
Date posted:
May 24, 2019
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Answers (1)
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When pure breeding red flowered plants were crossed with pure breeding white flowered plant, the offspring were all pink
flowered.
a) Using letter R to represent the...
(Solved)
When pure breeding red flowered plants were crossed with pure breeding white flowered plant, the offspring were all pink
flowered.
a) Using letter R to represent the gene for red coloured flower plants and W for the gene for the white flowered plants.
Workout the genotypic ratio of F2 generation.
b) State the phenotypic ratio of F2 generation.
c) i) What is the name given to a condition when two alleles in heterozygon state contribute equally to the phenotype of an
organizations.
ii) Give an example of a trait in human beings where the above condition in c(i) above express itself.
Date posted:
May 24, 2019
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Answers (1)
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A student setup the following apparatus to investigate a physiological process in animals. The set-ups were then left for one
hour.
a) What was the aim of...
(Solved)
A student setup the following apparatus to investigate a physiological process in animals. The set-ups were then left for one
hour.
a) What was the aim of the experiment?
b) i) What observation was made in:
Tube A
Tube B
ii) Account for the change that occurs in Tube A.
c) State the role of Tube B in the above experiment.
d) Explain what would be observed if a green leaf was introduced in Tube A in place of the cockroach then set-up exposed to
light for one hour.
Date posted:
May 24, 2019
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Answers (1)
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How is a sugarcane flower adapted to wind pollination?
(Solved)
How is a sugarcane flower adapted to wind pollination?
Date posted:
May 24, 2019
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Answers (1)
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What is polysepalous flower.
(Solved)
What is polysepalous flower.
Date posted:
May 24, 2019
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Answers (1)
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Describe the physiological process that help in regulation of the body temperature in man on a hot day.
(Solved)
Describe the physiological process that help in regulation of the body temperature in man on a hot day.
Date posted:
May 24, 2019
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Answers (1)
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Differentiate between photosynthesis and respiration.
(Solved)
Differentiate between photosynthesis and respiration.
Date posted:
May 24, 2019
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Answers (1)
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Identify the following apparatus and state it functions.
(Solved)
Identify the following apparatus and state it functions.
i) Name
ii) Function
Date posted:
May 24, 2019
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Answers (1)
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Name the type of muscle found in the gut.
(Solved)
Name the type of muscle found in the gut.
Date posted:
May 24, 2019
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Answers (1)
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What do you understand by the term synapse?
(Solved)
What do you understand by the term synapse?
Date posted:
May 24, 2019
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Answers (1)