a i)Moves upwards and inwards (towards Q);
ii)Moves downwards and (away from Q);
b i)String B;
ii)String A;
c Vertebral column;
marto answered the question on September 25, 2019 at 08:46
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Broad and thin lips are inheritable characteristics in humans. When a homozygote broad lipped man is married to a homozygote thin lipped woman, all the...
(Solved)
Broad and thin lips are inheritable characteristics in humans. When a homozygote broad lipped man is married to a homozygote thin lipped woman, all the children in the family are broad lipped. In a particular family, a woman that is heterozygote for broad lips is married to a man whose parents were both thin lipped. Let B represent gene for broad lips.
(a) Work out the genotypes of the children in that family. (Use a punnet square
(b) Work out the phenotypic ratio and genotypic ratio of the resulting children from the crossing in (a) above
(c) Give two sex- linked traits in man.
Date posted:
September 25, 2019
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Answers (1)
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The diagram below represents a stage in the development of human foetus.
(Solved)
The diagram below represents a stage in the development of human foetus.
(a) State one function of each of the structures labelled A and B.
(b) Apart from the size of the foetus what else from the diagram illustrates that parturition was about to occur.
Date posted:
September 25, 2019
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Answers (1)
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student peeled off a piece of epidermis from an onion leaf and observed it under a microscope. He counted 10 cells across the diameter of...
(Solved)
student peeled off a piece of epidermis from an onion leaf and observed it under a microscope. He counted 10 cells across the diameter of the field of view. He then placed a transparent ruler across the field of view and observed the following.
Calculate the size of one cell in μm. show your working
Date posted:
September 25, 2019
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Answers (1)
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An experiment to investigate a certain response by termites, was set up as shown below. The set up was exposed to the sun for some...
(Solved)
An experiment to investigate a certain response by termites, was set up as shown below. The set up was exposed to the sun for some time.
a) What were the results at the end of the experiment?
b) Name the type of response exhibited by the termites.
c) Give one survival value of the response.
Date posted:
September 25, 2019
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Answers (1)
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The Scientific name of confused beetle is TRIBOLIUM CONFUSAM. Identify any three mistakes made in writing the name.
(Solved)
The Scientific name of confused beetle is TRIBOLIUM CONFUSAM. Identify any three mistakes made in writing the name.
Date posted:
September 25, 2019
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Answers (1)
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In an experiment to investigate the action of pepsin on egg albumen, equal amount of pepsin were added to equal amount of egg albumen in...
(Solved)
In an experiment to investigate the action of pepsin on egg albumen, equal amount of pepsin were added to equal amount of egg albumen in different test tube. The test tubes were placed in water bath at different temperature. The graph below shows the time taken for the enzymes to digest protein at each temperature.
a) What is the optimum temperature for enzymes?
b) Account for the time taken to digest egg albumen at 600C.
c) With reason name the form in which the enzymes pepsin is secreted.
d) State three other factors that affect enzyme controlled reactions.
Date posted:
September 19, 2019
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Answers (1)
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The flow chart below, illustrates blood circulation in certain organs in humans.
(Solved)
The flow chart below, illustrates blood circulation in certain organs in humans.
a) Name the organ labeled A.
b) Name the blood vessel labeled B and F.
c) State how the consumption of blood in vessel E differs from that in vessel.
d) Name two hormones whose target is the liver when there is variation in simple carbohydrates concentration in blood.
Date posted:
September 19, 2019
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Answers (1)
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The figure below shows part of a food web for the South Atlantic ocean.
(Solved)
The figure below shows part of a food web for the South Atlantic ocean.
a) i) Name the producer in this food web.
ii) Name the top carnivore in this food web.
b) construct a food chain in which leopard seal is a tertiary consumer.
c) In the future, the extraction of mineral resources in the Antarctic might occur on a large scale. This could destroy the breeding-grounds of the Ross seal.
i) State and explain the effects this might have on the population of leopard seal.
ii) List two human activities that can affect the population of organisms in the ecosystem represented by food web.
d) Name the organism with the highest number of predators.
Date posted:
September 19, 2019
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Answers (1)
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The diagram below illustrates the behaviour of red blood cells when placed in two different solutions X and Y.
(Solved)
The diagram below illustrates the behaviour of red blood cells when placed in two different solutions X and Y.
i) Name the process represented by letter A and B.
ii) Identify the type of solution that would prevent processes A and B from taking place when the cells are placed in it.
iii) Draw a diagram to illustrate how a plant cell would appear if placed in solution Y.
Date posted:
September 19, 2019
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Answers (1)
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Name a chemical reagent that can be used to preserve specimens.
(Solved)
Name a chemical reagent that can be used to preserve specimens.
Date posted:
September 19, 2019
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Answers (1)
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During a Practical study students made measurements on a fish and found out that its body lengthfrom the tip of the mouth to the tail...
(Solved)
During a Practical study students made measurements on a fish and found out that its body length from the tip of the mouth to the tail tip was 30cm and the length from the tail tip to the anus was 12cm. Use this information to calculate the tail power of the fish.
Date posted:
September 18, 2019
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Answers (1)
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What is meant by tail power ?
(Solved)
What is meant by tail power ?
Date posted:
September 18, 2019
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Answers (1)
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The diagram below shows a cross-section through a pistil.
(Solved)
The diagram below shows a cross-section through a pistil.
a) Name the structures labelled K, L and M
b) What do the following parts develop into after fertilization.
i) Part M
ii) Part L
iii) Part N
Date posted:
September 18, 2019
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Answers (1)
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An experiment was set up as shown below.
(Solved)
An experiment was set up as shown below.
a) A student blew air in and out through point X. Using arrows, indicate on the diagram how air gets in and out of the setup.
b) i) In which of the test tube would lime water forms white precipitate first.
ii) Give a reason
Date posted:
September 18, 2019
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Answers (1)
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Identify the type of muscle in human being where formation and effect of lactic acid is not felt.
(Solved)
Identify the type of muscle in human being where formation and effect of lactic acid is not felt.
Date posted:
September 18, 2019
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Answers (1)
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In an experiment to investigate a product of photosynthesis, the set up was as shown in the diagram below. The apparatus was placed in the...
(Solved)
In an experiment to investigate a product of photosynthesis, the set up was as shown in the diagram below. The apparatus was placed in the sun.
a) State the confirmation test for gas Y
b) Explain why Elodea is the most suitable plant for this experiment.
c) State the functions of the sodium hydrogen carbonate in the experiment.
Date posted:
September 18, 2019
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Answers (1)
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A student added equal amounts of blood to equal volumes of salt of different concentrations. She observed and counted the red blood cells at the...
(Solved)
A student added equal amounts of blood to equal volumes of salt of different concentrations. She observed and counted the red blood cells at the beginning of the experiment and at end of the experiment. The results were as shown :
Account for the results in :
a) Set up A
b) Set up B
Date posted:
September 18, 2019
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Answers (1)
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Study the flow diagram showing the role of the pancreas in controlling blood glucose concentration;
(Solved)
Study the flow diagram showing the role of the pancreas in controlling blood glucose concentration;
i) Name the endocrine tissue labelled A.
ii) Name the hormone B produced by a cells.
iii) Name the hormone C produced by the B cells.
iv) Name the process represented by the dotted lines.
v) Briefly describe how hormone B brings about a rise in blood glucose concentration when it reaches
the liner.
Date posted:
September 18, 2019
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Answers (1)
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The diagram below represents the process that brings about blood clotting.
(Solved)
The diagram below represents the process that brings about blood clotting.
a) Name the substances A and B.
b) Name one source of calcium ions in the diet.
c) Name one more other role of calcium in the body.
d) Name the blood cells that are involved in blood clotting.
e) List down three structural adaptations of the red blood cells to their functions.
Date posted:
September 18, 2019
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Answers (1)
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Use the nitrogen cycle below to answer the questions that follow.
(Solved)
Use the nitrogen cycle below to answer the questions that follow.
a) Name the processes represented by
i) G
ii) Y
iii) K
b) Name the group of organisms that cause processes
i) C
ii) J
iii) L
c) Name the state in which nitrogen exist in
i) Plant tissue
ii) Atmosphere
Date posted:
September 18, 2019
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Answers (1)