- myelin sheath.
- Nodes of ranvier.
sharon kalunda answered the question on May 27, 2019 at 06:35
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Two potted plants A and B were placed in the dark for two days. Each was then placed in an air tight bell jar as...
(Solved)
Two potted plants A and B were placed in the dark for two days. Each was then placed in an air tight bell jar as follows then transferred to light for four hours. Each plant was then tested for starch.
a) why were the plants put in the dark place for two days.
b) what was the result of the starch test in plant B.Expain your answer.
Date posted:
May 27, 2019
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Answers (1)
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Name the polysaccharides found in the following structures.
a) Exoskeleton
b) Xylem vessels
(Solved)
Name the polysaccharides found in the following structures.
a) Exoskeleton
b) Xylem vessels
Date posted:
May 27, 2019
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Answers (1)
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Name two enzymes and one ion metal that are needed in the blood clotting process.
(Solved)
Name two enzymes and one ion metal that are needed in the blood clotting process.
Date posted:
May 27, 2019
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Answers (1)
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What is the role of Cotyledons in a germinating seed.
(Solved)
What is the role of Cotyledons in a germinating seed.
Date posted:
May 27, 2019
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Answers (1)
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A certain animal has no incisor, no canines, 6 premolars and 6 molar in its upper jaw. In the lower jaw there are 6 incisors,...
(Solved)
A certain animal has no incisor, no canines, 6 premolars and 6 molar in its upper jaw. In the lower jaw there are 6 incisors, 2 canines, 6 premolars and 6 molars. Write its dental formula
Date posted:
May 27, 2019
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Answers (1)
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Explain what leads to struggle for existence in organisms.
(Solved)
Explain what leads to struggle for existence in organisms.
Date posted:
May 27, 2019
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Answers (1)
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A group of students set up an experiment to demonstrate a certain process as shown below.
After 10 minutes the students carried out iodine test inside...
(Solved)
A group of students set up an experiment to demonstrate a certain process as shown below.
After 10 minutes the students carried out iodine test inside and outside the visiking tubing.
a) state two roles of the process being investigated in animals.
b) account for the results expected in the experiment above.
c)i) What is the importance of plasma membrane in active transport.
ii) Give one similarity between osmosis and active transport.
Date posted:
May 27, 2019
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Answers (1)
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Name the parts of a mammalian ear which carry out the following function (i) balance and posture (ii) hearing
(Solved)
Name the parts of a mammalian ear which carry out the following function
i) balance and posture
ii) hearing
Date posted:
May 24, 2019
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Answers (1)
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The number and distribution of stomata of three different leaves are shown in the table below
Suggest the possible habitat of the plant from which the...
(Solved)
The number and distribution of stomata of three different leaves are shown in the table below
Suggest the possible habitat of the plant from which the leaves were obtained
A
B
Date posted:
May 24, 2019
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Answers (1)
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Name the blood vessel that connects arteries to veins
(Solved)
Name the blood vessel that connects arteries to veins
Date posted:
May 24, 2019
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Answers (1)
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Name the organelles that would be most likely found in large numbers in cells that perform the functions below.
a) A cell in the ileum that...
(Solved)
Name the organelles that would be most likely found in large numbers in cells that perform the functions below.
a) A cell in the ileum that actively takes in glucose
b) A cell in the liver that breaks down foreign bodies
Date posted:
May 24, 2019
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Answers (1)
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State the function of the Node of ranvier structures in neurone.
(Solved)
State the function of the Node of ranvier structures in neurone.
Date posted:
May 24, 2019
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Answers (1)
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High temperature stops enzyme action.Explain.
(Solved)
High temperature stops enzyme action.Explain.
Date posted:
May 24, 2019
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Answers (1)
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Lack of magnesium leads to yellowing of leaves in plants.Explain.
(Solved)
Lack of magnesium leads to yellowing of leaves in plants.Explain.
Date posted:
May 24, 2019
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Answers (1)
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The thyroid glands swell in some individuals.Explain.
(Solved)
The thyroid glands swell in some individuals.Explain.
Date posted:
May 24, 2019
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Answers (1)
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What is the biological importance of denitrification
(Solved)
What is the biological importance of denitrification
Date posted:
May 24, 2019
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Answers (1)
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A couple gave birth to children with all types of blood groups. Suggest the possible genotypes of the parents
(Solved)
A couple gave birth to children with all types of blood groups. Suggest the possible genotypes of the parents
Date posted:
May 24, 2019
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Answers (1)
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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)