a) Glucose ? Ethanol + carbon (IV) oxide + energy
C6H12O6 ? 2C2H5OH + CO2 + Energy
b) Manufacturer of ethanol /biogas /baking (bread)
sharon kalunda answered the question on September 17, 2019 at 11:48
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Four cylinders of potato were carefully dried on blotting paper and weighed. Each piece weighed 3g. One was placed in each as shown in the...
(Solved)
Four cylinders of potato were carefully dried on blotting paper and weighed. Each piece weighed 3g. One was placed in each as shown in the drawing below.
a) After 48hours, which potato would be the heaviest
b) Name the substance whose movement was responsible for the weight changes in potato cylinders.
c) Name the process which was responsible for this movement in tubes B, C and D.
Date posted:
September 17, 2019
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Answers (1)
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In an experiment, Euglena was put in a petri dish. One side of the petri dish was illuminated and the other kept dark as shown...
(Solved)
In an experiment, Euglena was put in a petri dish. One side of the petri dish was illuminated and the other kept dark as shown below.
a) Name this type of response.
b) State the significance of this type of response in an organism.
c) Other than light, outline other two factors that may cause change of position in Euglena and state the respective type of response.
d) If the above experiment was repeated using a young potted seedling, name the type of response which will be observed.
e) Explain the behavior of the seedling after 3 days.
Date posted:
September 17, 2019
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Answers (1)
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What is the process that leads to addition or loss of one or more chromosomes?
(Solved)
What is the process that leads to addition or loss of one or more chromosomes?
Date posted:
September 17, 2019
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Answers (1)
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Study the diagram below and answer the questions that follow.
(Solved)
Study the diagram below and answer the questions that follow.
a) Identify the apparatus.
b) State the functions of the part labeled x.
Date posted:
September 17, 2019
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Answers (1)
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The set apparatus was assembled by a group of students to investigate some physiological process.
(Solved)
The set apparatus was assembled by a group of students to investigate some physiological process.
a) i) Give two aims of the experiment.
ii) Explain observations expected after 24hrs.
b) Before the experiment, the glucose was boiled the cooled.
i) Why was it necessary to boil the solution?
ii) What was the importance of the oil layer in the experiment?
c) Describe a control experiment for the set up?
d) Suggest one industrial application of the process being investigated?
Date posted:
September 17, 2019
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Answers (1)
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In an experiment, three healthy rabbits were fed with equal amounts of carbohydrates. After 1 hour their blood sugar glucose concentration was measured at 30...
(Solved)
In an experiment, three healthy rabbits were fed with equal amounts of carbohydrates. After 1 hour their blood sugar glucose concentration was measured at 30 minutes intervals for 3 hour. The results are as shown in the table below.
a.(i) Calculate the mean glucose concentration 1mg/ml of blood at 60 and 180 minutes.
(ii) On the grid provided plot a graph of mean glucose concentration against time.
(iii) What was the mean concentration in the blood after 75 minutes?
(iv)Why was it necessary to use 3 rabbits in the experiment?
v) Account for differences in mean glucose concentration between initial time and 180 minutes.
(b) Name three products of digestion other than glucose
(c) What is the fate of excess glucose in:
(i) Plants?
(ii) Animals ?
Date posted:
September 17, 2019
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Answers (1)
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The diagram below shows a section through the mammalian skin.
(Solved)
The diagram below shows a section through the mammalian skin.
a. Name the parts labeled Y and X
b. State the function of the parts labeled W and Z
c. Explain the changes that occur on the skin when it is cold
Date posted:
September 17, 2019
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Answers (1)
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The diagram below shows a flow chart of blood clotting mechanism in a human.
(Solved)
The diagram below shows a flow chart of blood clotting mechanism in a human.
a) Name the enzymes represented by the letters T and S.
b) Name the final products of the mechanism represented by letter R.
Date posted:
September 17, 2019
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Answers (1)
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The diagram below represents the vertical section of a fruit.
(Solved)
The diagram below represents the vertical section of a fruit.
a) Suggest the possible agent of dispersal of this fruit.
b) Explain two observable features that adapt the fruit to its mode of dispersal.
Date posted:
September 17, 2019
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Answers (1)
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A cross between a red flowered plants and white flowered plants produced plants with pink flowers. Using letter R to represent the gene for red...
(Solved)
A cross between a red flowered plants and white flowered plants produced plants with pink flowers. Using letter R to represent the gene for red color and W for white.
a) What were the parental genotypes?
b) Work out the cross between f1 generations.
c) State the phenotypic and genotypic ratios of the f2 generations.
Date posted:
September 17, 2019
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Answers (1)
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The flow diagram below represents passage of a meal through the human digestive system. Study the diagram and answer the questions that follow.
(Solved)
The flow diagram below represents passage of a meal through the human digestive system. Study the diagram and answer the questions that follow.
(a) Name the physical process that will occur in mouth cavity
(b) Name the digestive juices B and C
B...........................
C...........................
(c) Explain two ways in which the digestive system is protected from corrosive effects of digestive juices.
(d) Name the hormone that stimulate secretion of juice B.
(e) Identify two contents of digestive juice A
Date posted:
September 17, 2019
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Answers (1)
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Name the source of hydrochloric acid in the mammalian stomach.
(Solved)
Name the source of hydrochloric acid in the mammalian stomach.
Date posted:
September 17, 2019
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Answers (1)
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An experiment shown below was a set up to investigate a certain physiological process in plants.
(Solved)
An experiment shown below was a set up to investigate a certain physiological process in plants.
a) What process was being investigated? (1 mark)
b) What effect will the following have on the observation made in (a) above?
i) Fanning the shoot
ii) Removing all the leaves from the shoot.
iii) Placing the set up in the dark.
Date posted:
September 17, 2019
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Answers (1)
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The following diagram of a leaf shows what happens in a plant leaf during photosynthesis.
(Solved)
The following diagram of a leaf shows what happens in a plant leaf during photosynthesis.
(a) State two ways in which leaves are adapted to absorb light.
(b) Name the gases labeled x and y.
(c) Name the tissues that transports:-
(i) Water into the leaf.
(ii) Sugar to other parts of the plant.
(d) Explain why it is an advantage for the plant to store carbohydrates as starch rather than as sugars.
Date posted:
September 16, 2019
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Answers (1)
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The apparatus below illustrate breathing in a mammal.
(Solved)
The apparatus below illustrate breathing in a mammal.
(a) Describe what happens if the rubber plug is pulled in the direction shown by the arrow.
(b) Give the parts of mammal represented by:-
(i) Capillarity tube.
(ii) Rubber plug.
Date posted:
September 16, 2019
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Answers (1)
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Explain how dioecism prevent self-pollination
(Solved)
Explain how dioecism prevent self-pollination
Date posted:
September 16, 2019
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Answers (1)
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A student observed a row of 16 epidermal cells in a microscopic field that was 8mm in diameter. Calculate the average length of each cell...
(Solved)
A student observed a row of 16 epidermal cells in a microscopic field that was 8mm in diameter. Calculate the average length of each cell in micrometers.
Date posted:
September 16, 2019
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Answers (1)
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A scientific space craft brought some material to earth from the outer space. Explain how one would establish if the material is living or non-living.
(Solved)
A scientific space craft brought some material to earth from the outer space. Explain how one would establish if the material is living or non-living.
Date posted:
September 16, 2019
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Answers (1)
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The diagram below represents three types of neurons found in a mammalian body.
(Solved)
The diagram below represents three types of neurons found in a mammalian body.
(a) Name the neurons X, Y and Z
(b) Name the chemical substance responsible for the transmission of an impulse across the gap labelled W.
(c) State two functions of the part labelled M.
(d) In which part of the spinal cord is neurone Y located?
(e) Using arrows indicate on the diagrams the direction followed by nerve impulse leading to a response.
Date posted:
September 16, 2019
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Answers (1)
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Below is a diagram of a plant a form three student collected while carrying out an ecological study
(Solved)
Below is a diagram of a plant a form three student collected while carrying out an ecological study
a) With reasons identify the division into which the students classified the plant.
b) (i) Name the structure that produces spores in this plant.
(ii) State two differences between the plant division above and that of the division spermatophyta.
c) Give two distinguishing features of class Amphibia
Date posted:
September 16, 2019
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Answers (1)