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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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Some form three students took a germinating maize grain and placed it in a starch paste in a petri dish and put the Petri dish in a water bath maintained at 30oC. After 48 hours the starch paste was irrigated with iodine solution .The area around the maize grain changed to the colour of iodine solution while the rest turned blue –black.
(a) Account for the observation
(b) Why was the Petri dish put in a water bath maintained at 30oC?
Date posted:
September 16, 2019
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A1B1C1D1 is the image of ABCD under a shear parallel to x – axis D(2,4) is mapped onto D1(1,4) while A(-1,1) is mapped onto A1(1,1). If the co – ordinates of A,B,C and D are (-1,1), (0,1), (3,4) and (2,4) respectively:-
(a)Draw ABCD and A1 B1C1 and D1 under the shear on the grid provided and state
Co-ordinates of B1 and C1.
(b)State the invariant line.
(c)A1 B1C1 and D1 undergoes a stretch parallel to y – axis with scale factor -2 and invariant line y =3. On the same grid, draw A//B//C//D// the image of A1 B1C1 D1 under the stretch
(d)Describe completely the transformation that maps A//B//C//D// onto ABCD.
Date posted:
September 16, 2019
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The diagram below represents a simple endocrine feedback mechanism in a human male.
(a) Name the hormone labeled X
(b) State two differences that may be observed between a normal male and one who is incapable of producing hormone labeled Y
Date posted:
September 16, 2019
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Active yeast cells were added to a dilute sugar solution in a container. The mixture was kept in a warm room. After a few hours bubbles of gas were observed escaping from the mixture.
(a) Write an equation to represent the chemical reaction above.
(b) What is the economic importance of this type of chemical reaction in industry?
Date posted:
September 16, 2019
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Name the division of the Kingdom plantae with the following spore producing bodies.
(i) Sori
(ii) Capsule
Date posted:
September 16, 2019
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A small amount of chemical M was put on one side of maize celeoptiles. After some days, it was noted that the celeoptiles curved away from the side to which the chemical was applied.
(a) Suggest the possible identity of chemical substance M
(b) Explain how this chemical might have caused the celeoptiles to curve.
Date posted:
September 16, 2019
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Use a ruler and compass ONLY for all constructions in this question.
(a)Construct a triangle ABC in which AB=6 cm, BC= 7 cm and angle ABC = 750.
(b)Measure
(i)the length of AC
(ii)the angle ACB
(c)(i)Construct the locus of p such that BP = PC
(ii)Construct the locus of Q such that Q is on the opposite side of BC as A and angle
BCQ = 300.
(d)(i)the locus of P and Q meet at X, mark X .
(ii)Construct the locus of R in which angle BRC = 1200.
Date posted:
September 16, 2019
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The table below shows taxation rates in Kenya.
A civil servant is provided with a house and pays a nominal rent of Ksh. 6260 per Month. In addition the government gives him a medical allowance of Kshs. 7,000 p.m, entertainment allowance of Kshs. 3,000 p.m. He is entitled to a personal relief of Ksh. 1700 p.m. If the civil servants net tax is Kshs. 6,900 p.m.
Determine his :-
(a)Gross tax p.m
(b)Taxable income p.m
(c)Basic salary p.m
Date posted:
September 16, 2019
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Industrial wastes may contain metabolic pollutants. State how such pollutants may indirectly reach and accumulate in the human body if the wastes were dumped into rivers.
Date posted:
September 16, 2019
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The apparatus whose diagram is given below can be used to demonstrate results of a physiological process that occurs in a mammal. To use the apparatus, the experiment places his mouth at the point marked X and breaths in and out gently.
a. State the observations in the boiling tube when the experimenter
i) Breaths in:
Boiling tube, A
Boiling tube, B
b) Breaths out:
Boiling tube, A
Boiling tube, B
c. What conclusions can you draw from the results of this experiment
d. What is the purpose of the boiling tube A?
Date posted:
September 16, 2019
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A patient whose blood group is A died shortly after receiving blood from a person of blood group B. Explain the possible cause of the death of the patient.
Date posted:
September 16, 2019
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State two ways in which human body is naturally protected against harmful bacteria.
Date posted:
September 16, 2019
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A computer whose marked price is sh. 40,000 is sold at sh. 56,000 on hire purchase terms. Mary bought the computer on hire purchase terms. She paid a deposit of 25% of the hire purchase and cleared the balance by equal Monthly installments of sh. 2625. Calculate the rate of interest charged per Month.
Date posted:
September 16, 2019
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Given that OA = 3i + 2j - 4k and OB = 4i -2k and P divides AB externally in the ratio 3:2. Determine the coordinates of P.
Date posted:
September 16, 2019
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The coordinates of the end points of the diameter of a circle are A(2,4)and B(-2,6). Find the equation of a circle in the form
ax2 + by2 + cx + dy + e = 0
Date posted:
September 16, 2019
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The cost of producing a commodity consists of transport, labour and raw materials in the ratio 8:4:12 respectively. If the transport cost increases by 12%, labour cost by 18% and materials by 40%. Find the percentage increase of producing the new commodity.
Date posted:
September 16, 2019
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A triangle ABC is transformed by the matrix
to give a straight line. Find the acute angle x in the matrix.
Date posted:
September 16, 2019
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In order to determine the molar heat of neutralization of 1M potassium hydroxide, 200cm³ of 1M hydrochloric acid both at the same temperature were mixed and stirred continuously with a thermometer. The temperature of the resulting solution was recorded after every 30 seconds until the highest temperature of the solution was attained.
(a) (i) Why was it necessary to stir the mixture of the two solutions?
(ii) Write an ionic equation for the reaction.
(b) The initial temperature for both solution was 24.5°C and the highest temperature attained by the mixture was 30.9°C. Calculate the
(i) heat change for the reaction.
(Specific heat capacity of the solution is 
Density of the solution is 
The volume of KOH used was 200cm³.
(ii) molar heat of the neutralisation.
(c) If ammonium hydroxide was used instead of potassium hydroxide the heat of neutralization would be different from the one obtained in b(ii) above.
Explain the difference.
(d) Draw an energy level diagram for the reaction between potassium hydroxide and hydrochloric acid.
Date posted:
September 16, 2019
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Mr.Mutuku earns sh.15,500 p.m .He is housed by his employer and pay a rent of sh.1200 per month for taxation purposes his taxable income is raised by 155.If he gets tax relief of sh.720 per month calculate his P.A.Y.E
Date posted:
September 16, 2019
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The figure below shows feet of various birds. Study the diagram and answer the questions that follow.
(a) Giving a reason, state the type of food eaten by Bird E.
Food eaten:
Reason:
(b) Name the habitat of bird D and give a reason for your answer.
Habitat:
Reason:
(c) Identify the type of structures shown by the feet above and give a reason for your answer.
Type of structure:
Reason:
(d) State the type of evolution shown by the structures.
Date posted:
September 16, 2019
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Explain why lead carbonate is not reacted with dil. H2SO4 in preparation of carbon (IV) oxide in the laboratory.
Date posted:
September 16, 2019
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The table below shows ammeter readings obtained where different electrolytes of the same concentration were tested.
Explain why ethanoic acid gave a lower ammeter reading the copper (II) sulphate solution.
Date posted:
September 16, 2019
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An experiment was carried out to determine the growth rates of bamboo and a variety of maize plants in two adjacent plots.The average height and average dry weight of plants from the two populations were determined over a period of twenty weeks. The data is as shown in the table below.
(a) Between which two weeks did the greatest increase in weight occur in:
(i) Bamboo plants:
(ii) Maize plants:
(b) (i) Which of the two types of plants had a higher productivity by the end of the experiment?
(ii) Give a reason for your answer in (b) (i) above.
(c) Between weeks 14 and 18, the average height of the maize plants remained constant while average dry weight increased.Explain this observation.
(d) Suggest how the change in the average dry weight bamboo and maize plants would have been at week 22 if the experiment was continued.
(e) Why was it appropriate for this experiment to use:
(i) Dry weight instead of fresh weight.
(ii) Weight and height.
(f) Describe how the average height and weight of the plants were determined in this experiment.
(i) Average height.
(ii) Average dry weight.
(g) Give a reason why secondary thickening does not occur in bamboo and maize plants.
Date posted:
September 16, 2019
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Study the scheme given below and answer the questions that follow.
(i) Write an equation for the reaction between propan-l-ol and potassium metal.
(ii) Name process I and II.
(iii) Identify the products A and B.
(iv) Name one catalyst used in Process II.
(v) Draw the structural formula of the repeating unit in the polymer C.
(vi) Write the structural formula of 2, 3-dichloropropene.
Date posted:
September 16, 2019
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The equation below represents a certain physiological process. Study it and answer the questions below.
(i) Name the above process.
(ii) Give two reasons for question (i) above.
(iii) Calculate the respiratory quotient of the compound that was as the substrate.
(iv) Identify the substrate being respired in the above equation.
(v) State one importance of this process to living organisms.
(vi) Name the organelle where the above process takes place in animal cells.
Date posted:
September 16, 2019
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The probability that a pupil goes to school by a boda-boda is 2/3 and by a matatu is ¼ .If he uses a boda-boda the probability that he is late to school is 2/5 and if he uses a matatu the probability of being late is 3/10 . If he use other means of transport the probability of being late is 3/20 .
(a) Draw a tree diagram to represent this information.
(b) Find the probability that he will be late for school.
(c) Find the probability that he will be late for school if he does not use a matatu.
(d) What is the probability that he will not be late to school
Date posted:
September 16, 2019
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A man with normal skin colour got married to a woman with normal skin colour. They gave birth to three children; one of them an albino.
(a) Identify the probable genotype of the parents using letter (A) for normal gene and (a) for defective gene.
Man:
Woman:
(b) Using a genetic cross; show the genotypes of the offspring.
(c) Give the phenotypic ratio of the offsprings.
Date posted:
September 16, 2019
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The grid below shows part of the periodic table. Use it to answer questions that follow. The letters do not represent the actual symbols of the elements.
(a) (i) Which of the element has the lowest ionization energy?
(ii) Explain your answer in a(i) above.
(b) (i) Identify the most reactive non-metal.
(ii) Explain your answer in b(i) above.
(c) Give the electronic configuration of element.
(i) S
(ii) Q
(d) Compare the atomic radius of P and R. Explain.
(e) The mass number of W is 40. Write down the composition of its nucleus.
(f) Write formula of oxides of P.
(g) (i) What is the name given to elements found in the shaded region.
(ii) Which elements can be used to provide an inert environment?
Date posted:
September 16, 2019
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(a) Using electrons in the outermost energy level, draw dots and crosses (x) diagram for H3O+ and C2H4 (H = 1, C = 6,
O = 16)
(b) What would be the effect of dipping litmus paper in aqueous solution of H3O+?
Date posted:
September 16, 2019