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- An experiment was set as shown below(Solved)
An experiment was set as shown below
(a) Name the gas F
(b) State one physical characteristic of gas F.
(c ) What would be observed if a litmus paper was put in a solution of gas F.
Date posted: September 17, 2019.
- Part of one strand of a DNA molecule was found to have the following sequence. Show the complementary strand G-C-C-A-G-A-T-C-A-C(Solved)
Part of one strand of a DNA molecule was found to have the following sequence. Show the complementary strand G-C-C-A-G-A-T-C-A-C
Date posted: September 17, 2019.
- The table below shows the observations made on tests carried out on a colourless liquid sample.(Solved)
The table below shows the observations made on tests carried out on a colourless liquid sample.
(a) Identify (i) Cation in the sample
(ii) Anion in the sample
(b) Write the ionic equation for the reaction taking place in experiment (III).
Date posted: September 17, 2019.
- The following figure represents the forelimbs of certain animal species. Study them and answer the questions that follow.(Solved)
The following figure represents the forelimbs of certain animal species. Study them and answer the questions that follow.
a) Name the parts labeled E, F and G.
b) Name the type of joint at point K
c) Which features represent
i) Analogous structures
ii) Homologous structures
iii) Give a reason for (ii) above
d) i) What are vestigial organs?
ii) Give two examples of vestigial organs in Humans
e) State the type of skeleton found;
i) In figure I
ii) On the part labeled S on figure 3
Date posted: September 17, 2019.
- Convert the following recurring decimal to a fraction 5.3°17°(Solved)
Convert the following recurring decimal to a fraction 5.3°17°
Date posted: September 17, 2019.
- The figure below shows a solid with the base ABCD being a rectangle. AB = 16cm, BC = 12cm and CE = 20cm
Calculate the angle...(Solved)
The figure below shows a solid with the base ABCD being a rectangle. AB = 16cm, BC = 12cm and CE = 20cm
Calculate the angle between the planes EBD and ABCD.
Date posted: September 17, 2019.
- Photographs below represent specimen taken from three species of plants.(Solved)
Photographs below represent specimen taken from three species of plants.
i) Describe the androecium in specimen N1
ii) Identify the class to which the specimen N1 and B belong. Give a reason in each case.
Specimen N1……
Reason…..
Specimen B
Reason……
iii) Suggest the agent of pollination of the specimens N1 and N2
iv) Give reasons for your answer in a (iii) above.
v) Label non-essential part of the flower of specimen N2.
b) With a reason state the agent of pollination of the flower in specimen.
Date posted: September 17, 2019.
- The Figure below shows a circle with centre o
Determine the co-ordinates of the centre radius of the circle and find the equation of the circle
(Solved)
The Figure below shows a circle with centre o
Determine the co-ordinates of the centre radius of the circle and find the equation of the circle
Date posted: September 17, 2019.
- Factorize a2 –b2 hence find the exact value of 48972 – 47972(Solved)
Factorize a2 –b2 hence find the exact value of 48972 – 47972
Date posted: September 17, 2019.
- 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.
- a) Given that y = 2cos (2x – 30)o is the equation of a curve state the amplitude and period of the curve
b)Given that y...(Solved)
a) Given that y = 2cos (2x – 30)o is the equation of a curve state the amplitude and period of the curve
b)Given that y = -1 1/5 in the above function, find x where ![fig281792019949.png](/questions/uploads/fig281792019949.png)
Date posted: September 17, 2019.
- 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.
- Study the flow chart below and answer the question that follow.(Solved)
Study the flow chart below and answer the question that follow.
(a) Identify substances P and Q
(b) What name is given to the type of reaction in step 2 ?
Date posted: September 17, 2019.
- Machine A can do a piece of work n 6 hours while machine B can do the same piece of work in 9 hours. Machine...(Solved)
Machine A can do a piece of work n 6 hours while machine B can do the same piece of work in 9 hours. Machine A was set to do the piece of work but after 3 hours it broke down and machine B did the rest of the work. Find how long would machine B take to do the rest of the work
Date posted: September 17, 2019.
- The diagram below represents a neurone.(Solved)
The diagram below represents a neurone.
a) Name the neurone shown in the above diagram.
b) State the functions of parts labeled N and M.
c) Using an arrow indicate the direction of impulse transmission on the diagram.
Date posted: September 17, 2019.
- Make t the subject of the formular(Solved)
Make t the subject of the formular
![fig251792019938.png](/questions/uploads/fig251792019938.png)
Date posted: September 17, 2019.
- Give two reasons why the evolution of human enabled him to survive better than his hominid ancestors.(Solved)
Give two reasons why the evolution of human enabled him to survive better than his hominid ancestors.
Date posted: September 17, 2019.
- The data below was recorded when metal K was completely burnt in air. K is not the actual symbol of the metal.
(R.A.M; K = 56,...(Solved)
The data below was recorded when metal K was completely burnt in air. K is not the actual symbol of the metal.
(R.A.M; K = 56, O = 16 )
Mass of empty crucible and lid = 10.240g
Mass of crucible, lid and metal K = 10.352g
Mass of crucible, lid and metal oxide = 10.400g
(a) Determine the mass of
(i) Metal K
(ii) Oxygen
(b) Determine the empirical formula of the metal oxide.
Date posted: September 17, 2019.
- 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.
- Given the equation of a curve
Y = (2x +2)(x2 + 3)
i)Find the function of the gradient of the curve and its value when...(Solved)
Given the equation of a curve
Y = (2x +2)(x2 + 3)
i)Find the function of the gradient of the curve and its value when x = 3/2
ii)Determine the equation of the normal to the curve at the point (-2, 3)
Date posted: September 17, 2019.
- A certain type of gene mutation changed the word „skip? to sip. Identify the type of gene mutation that occurred.(Solved)
A certain type of gene mutation changed the word „skip‟ to sip. Identify the type of gene mutation that occurred.
Date posted: September 17, 2019.
- 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.
- 60cm3 of oxygen gas diffused through a porous partition in 50 seconds. How long will it take 120cm3 of sulphur (IV) oxide gas to diffuse...(Solved)
60cm3 of oxygen gas diffused through a porous partition in 50 seconds. How long will it take 120cm3 of sulphur (IV) oxide gas to diffuse through the same partition under the same conditions.
Date posted: September 17, 2019.
- 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.
- Use matrix method to solve the following pair of simultaneous equation
3x + 2y = 12
-y + 4x = 5
(Solved)
Use matrix method to solve the following pair of simultaneous equation
3x + 2y = 12
-y + 4x = 5
Date posted: September 17, 2019.
- Using the table below, answer the questions that follow.(Solved)
a)Using the table below, answer the questions that follow.
Suggest the possible habitat of the plants from the leaves were obtained
A
B
C
B) State the modifications in the stomata of leaf C
Date posted: September 17, 2019.
- P varies directly as Q and inversely as the square of R. When Q=5 and R=3, P=20. Find R when P=21.6 and Q=15 (Solved)
P varies directly as Q and inversely as the square of R. When Q=5 and R=3, P=20. Find R when P=21.6 and Q=15
Date posted: September 17, 2019.
- i) Name the blood vessels that supplies the cardiac muscles with its requirements.
ii) State the congenital defect of the blood vessels resulting from prolonged...(Solved)
i) Name the blood vessels that supplies the cardiac muscles with its requirements.
ii) State the congenital defect of the blood vessels resulting from prolonged large intake of cholesterol in the blood.
Date posted: September 17, 2019.
- 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.
- In an experiment magnesium ribbon was reacted with dilute sulphuric (VI) acid and the volume of hydrogen gas produced with time noted. The graph below...(Solved)
In an experiment magnesium ribbon was reacted with dilute sulphuric (VI) acid and the volume of hydrogen gas produced with time noted. The graph below shows the volume of gas produced with time
Explain the following observations.
(i) The curve of the graph is steepest at the beginning.
(ii) The curve of the graph completely flattens at region AB.
(iii) On the same axis plot the curve that would be obtained if the acid used was ethanoic acid. Label it ethanoic acid
Date posted: September 17, 2019.