a) 35°C ± 1
b) At 60°C digestion takes long because the enzymes are denatured; by high temperature;
c) Pepsinogen; to prevent the digestion of cells that produce it
d) pH
- Presnce or absence of enzyme inhibitors.
- Enzyme concentration
- Substrate concentration;
- Presence of co-factors;
sharon kalunda answered the question on September 19, 2019 at 13:03
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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)
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The diagram below represents a food web from lake Nakuru National Park.
(Solved)
The diagram below represents a food web from lake Nakuru National Park.
a) i) Identify the organism with the largest biomass.
ii) Give a reason for your answer in a (i) above.
b) From the food web, isolate a food chain ending with snakes as tertiary consumers.
c) i) Name any two organisms not shown in the food web but would be present in the ecosystem.
ii) What is the role of the organisms stated in c (i) above?
d) From the food web, snakes and leopards feed on rabbits. What name is given to this kind of competition?
e) From the food web, name an organism that may be both a secondary and a tertiary consumer.
Date posted:
September 18, 2019
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Answers (1)
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In an experiment two equal volumes of solution L and M were placed into visking tubing. The visking tubing was suspended into beakers containing equal...
(Solved)
In an experiment two equal volumes of solution L and M were placed into visking tubing. The visking tubing was suspended into beakers containing equal volumes of solutions K. The set –up is as shown in the diagram A and B. The set-up was allowed to stand for 45 minutes and results are as shown in the diagrams.
(a) Name the process that was being demonstrated.
(b) Explain the results that were obtained at the end of the experiment in
(i) Set-up A.
(ii) Set up B.
Date posted:
September 18, 2019
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Answers (1)
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Name two regions in human body that displays counter-current flow system.
(Solved)
Name two regions in human body that displays counter-current flow system.
Date posted:
September 17, 2019
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Answers (1)
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State the type of placentation found in the following fruits.
i) Pawpaw
ii) Orange
iii) Bean pod
(Solved)
State the type of placentation found in the following fruits.
i) Pawpaw
ii) Orange
iii) Bean pod
Date posted:
September 17, 2019
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Answers (1)
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After an ecological study of feeding relationship students constructed the food web below.
(Solved)
After an ecological study of feeding relationship students constructed the food web below.
a) Name the process through which energy from the sun is incorporated into the food web.
b) State the mode of feeding of the birds in the food web.
c) Name two ecosystems in which the organisms in the food web live.
d) From the information in the food web, construct a food chain with the large bird as a quaternary consumer.
e) What would happen to the organism in the food web if bird N migrated?
f) Not all the energy from one trophic level is available to the next level. Explain.
g) i) Two organisms which play a role in the ecosystem are not included in the food web. Name them.
ii) State the role played by the organisms named in g (i) above.
h) i) State three human activities that would affect the ecosystems.
Date posted:
September 17, 2019
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Answers (1)
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The diagram shows a set up to investigate anaerobic respiration in germinating bean seed.
(Solved)
The diagram shows a set up to investigate anaerobic respiration in germinating bean seed.
a) What is the purpose of the pyrogallic acid?
b) State the importance of the water bath in the experiment.
c) Write a word equation for anaerobic respiration taking place in the germinating beans.
d) Explain why plants can only respire anaerobically for a short period of time.
e) What would be product if the process was taking place in animal muscle?
f) Distinguish between obligate and facultative Anaerobes.
g) Name the site for anaerobic respiration in a cell.
Date posted:
September 17, 2019
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Answers (1)