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Name the source of hydrochloric acid in the mammalian heart.
Date posted:
September 16, 2019
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A cattle dip is 150cm wide and 12m long. The depth of the water increases uniformly from a shallow end of 60cm to a maximum of 6m.
(a)Find the volume of water that can be held by the full dip in litres
(b)If the dip is drained by a pipe of radius 15cm at the rate of 6m/l, how long will it take to drain a full dip?
Date posted:
September 16, 2019
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The diagram below represent large scale manufacture of hydrochloric acid.
Study it and answer the questions that follow.
(a) Identify.
(i) Gas A
(ii) Gas B
(b) Write the chemical equation for the reaction between gas A and B.
Date posted:
September 16, 2019
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The chemical equation below represents a physiological process that takes place in living organisms.
Name:
(i) The process R:
(ii) Substance Q:
Date posted:
September 16, 2019
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Explain why tracheids are not efficient in transporting water up the plant.
Date posted:
September 16, 2019
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The position vector of A and B are a=4i+4j-6k and b =10i+4j+12k.D is a point on AB such that AD:DB is 2:1.
Find the co-ordinates of D.
Date posted:
September 16, 2019
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A student was provided with 1.5g of XCO3. He reacted it with 50cm³ of 1M HCl which was excess. Determine the volume of CO2 produced at S.T.P.
(R.F.M of x CO3 = 100) molar gas volume at S.T.P = 22400cm³.
Date posted:
September 16, 2019
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Find the percentage error in calculating the volume of a sphere radius 4.9cm.
Date posted:
September 16, 2019
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The figures below represent mammalian tissue as seen under a light microscope.
(a) Identify the tissue
(b) Name the cells represented by R,S and T
(c) State the function of structure S and R.
(d) Explain two adaptations of structure T to its function.
(e) Name the hereditary condition a person with structure T is suffering from.
Date posted:
September 16, 2019
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State the role of carnassial teeth in a lion..
Date posted:
September 16, 2019
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Sulphur (IV) oxide and nitrogen (IV) oxide reacts as shown in the equation below.
SO2 + NO2----->SO3(g) + NO(g)
(a) Using oxidation numbers show that this is a redox reaction.
(b) Identify the reducing agent.
Date posted:
September 16, 2019
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The diagram below shows two potted plants on a laboratory bench near a window.
a) State one observable difference between the plants I and II.
b) State the importance of the process that is seen in plant I.
c) Explain the process that resulted to appearance of the leaves as in plant I above.
d) Suppose a cell from a leaf of each of the plants I and II is mounted and observed under a microscope. Draw a diagram of a cell from each of the plants leaves.
Date posted:
September 16, 2019
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The diagram below represents microvilli on epithelial cells
(a) Name the parts A and C
(b) Name two parts in the human body where the above epithelial cells are found.
Date posted:
September 16, 2019
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During an ecological study of a lake, a group of students recorded the following observations.
(i) Planktonic crustaceans feed on planktonic algae;
(ii) Small fish feed on planktonic crustaceans, worms and insect larvae;
(iii) Worms feed on insect larvae;
(iv) A bird species feeds on small fish, planktonic crustaceans, worms and large fish;
(v) Insect larvae feed on planktonic algae;
(vi) Large fish feed on small fish.
(a) From this record of observations, construct a food web.
(b) From the food web, isolate and write down a food chain that ends with:-
(i) Bird species as a secondary consumer.
(ii) Large fish as a tertiary consumer.
(c) The biomass of the producers in the lake was found to be greater than that of primary consumers. Explain this observation.
(d) Using the food web, identify three pairs of organisms that compete for food in the lake and for each case, name the food being competed for.
(e) (i) State three ways by which human beings may interfere with this lake ecosystem.
(i) Explain how each of the ways stated in (e) (i) above may affect life in the lake.
Date posted:
September 16, 2019
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15cm³ of a gaseous hydrocarbon reacted completely with 45cm³ of oxygen. 30cm³ of carbon (IV) oxide were formed.
Determine the formula of the hydrocarbon given that all volumes of gases were measured under the same conditions of temperature and pressure.
Date posted:
September 16, 2019
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You are provided with photographs of animals. Study the photographs and the dichotomous key below to enable you identify the taxonomic group to which each animal belongs.
KEY
1. a) Jointed legs present ………………………………………………………………go to 2
b) Jointed legs absent………………………………………………………………..go to 7
2. a) Three pairs of legs ………………………………………………………………..go to 3
b) More than 3 pairs of legs………………………………………………………….go to 5
3. a) Wings present …………………………………………………………………….go to 4
b) Wings absent………………………………………………………………………Anoplura
4. a) One pair of wings…………………………………………………………………Diptera
b) Two pairs of wings……………………………………………………………Hymenoptera
5. a) Four pairs of legs ………………………………………………………………… Arachnida
b) More than ten pairs of legs ………………………………………………………. go to 6
6. a) One pair of legs in each body segment…………………………………………… Chilopoda
b) Two pairs of legs in each body segment ………………………………………… Diplopoda
7. a) Body partially enclosed in a shell………………………………………………… Mollusca
b) Body surface has spiny projection…………………………………………….Echinodermata
a) Using the key, identify the following organisms to their taxonomic groups. In each case, give the sequence of steps which you followed in identifying them.
b) i) Using observable features only, state the class to which the animal labeled A and B on the photographs above belong.State two observable features on B, that enabled you to arrive at that answer in (b) (i) above.
Date posted:
September 13, 2019
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A student divided a small air tight box into two chambers with wire mesh. In one chamber he kept a number of rats and in the other a number of potted plants. What was likely to happen if the box was placed in the dark for two hours? Explain your answer.
Date posted:
September 13, 2019
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When transplanting a seedling, it is advisable to remove some of the leaves .Explain
Date posted:
September 13, 2019
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Demand for bananas in a certain market has been declining over time.
Explain four factors that may be responsible for this trend.
Date posted:
September 13, 2019
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The figure below shows the embryo-sac before fertilization.
(a) Identify the structures labeled A and B.
(b) Identify the structures labelled in the diagram that will develop into the following after fertilization.
(i) Embryo
(ii) Endosperm
(c) State the ploidy of each the following nucleic after fertilization
(i) C
(ii) D
Date posted:
September 13, 2019
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Explain five ways through which the Central Bank regulates economic activities in the Country.
Date posted:
September 13, 2019
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On 1st march 2017 Kamau had cash in hand Ksh 7,800 and a bank overdraft of Ksh 24,300.During the month, the following transactions took place
March 3 cash sales paid directly into the bankKsh 16,500
4 bought goods for Ksh 15,000 and paid by cheque
6 cash sales Ksh. 50,000
9 received a cheque of ksh 18,000 from Amolo in full settlement of his debt
13 paid insurance premiums of Ksh 16,000 in cash
15 paid Kamotho by cheque Ksh 9,700 in full settlement of his account less 3% cash discount
21 withdrew Ksh 30,000 from bank for office use
24 received a cheque of Ksh23,750 from Rotich in full settlement of his account less 5% cash discount
25 paid wages in cash Ksh 20,000
30 banked all cash except Ksh 3,000
Required: prepare a three column cash book
Date posted:
September 13, 2019
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In maize the gene for the purple colour is dorminant for the gene for white colour. A purple colour was crossed with heterozygous plant. Using letter G to represent the gene for purple colour, work out the genotypic ratio of the offspring. Show your working.
Date posted:
September 13, 2019
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(a) Given a sample of urine, name one test you would carry out to determine if it was obtained from a person suffering from diabetes mellitus.
(b) What results are expected if one is diabetic?
Date posted:
September 13, 2019
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Complete the table below for the functions y = 2 sin (x – 300) and y = Cos 2x.
(a) On the same set of axes, draw the graphs of y = 2 Sin (x - 30) and y = cos 2x in
The range 00 < 3600
(b) Use your graph to solve the equation 2 sin (x - 300) = cos 2x
(c) State the,
(i) phase angle for the wave y = 2 Sin (x -30°)
(ii) period for the wave y = cos 2x.
Date posted:
September 13, 2019
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A goat weighing 20kg requires 216KJ while a mouse weighing 54gms requires 2830KJ per day. Explain.
Date posted:
September 13, 2019
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Give four major characteristics of mosaic technique of picture making.
Date posted:
September 13, 2019
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Mr. Juma has sued Serenity Hospital on grounds that their child was wrongly identified such that they got the wrong one.The child is blood group O. Mr. Juma is blood group AB while Mrs. Juma is heterozygous blood group A.
(a) Work out the possible blood group of their offsprings.
(b) Is Mr. Juma justified in his claims?
Date posted:
September 13, 2019
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The table below shows monthly income tax rates.
A civil servant earns a salary of Sh.42000 and is provided with a house at a nominal rent of Sh. 1500 per month.
(a) Taxable pay is the employee’s salary plus 15% of salary less nominal rent. Calculate the civil servant’s taxable income in K£ p.m.
(b) If the employee is entitled to a personal relief of Sh.900 p.m., what is his PAYE?
(c,) The following deductions are made from his gross monthly pay; NHIF - Sh 630, WCPS - Sh 540, Union dues - Sh 330, SACCO loan recovery - Sh.7000 and Co - operative shares Sh.2500 Calculate his net monthly pay.
Date posted:
September 13, 2019
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The diagram below show single circulation of a fish.
(a) Write down the names of the parts labelled T,U and V.
(b) Explain the main disadvantage of this type of circulation.
(c) How is this type of circulation different from that found in man?
Date posted:
September 13, 2019