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State four differences between mitotic and meiotic divisions.
Date posted:
September 30, 2019
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The machine represented in the diagram can be used to lift water from a well.
A force of 50N applied on the handle lifts water of weight 180N
i) Calculate the efficiency of the machine.
ii) Give a reason why the efficiency is less than 100%.
Date posted:
September 30, 2019
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Mention two pieces of evidence which are advanced to support the view that end, products of photosynthesis are translocated in phloem.
Date posted:
September 30, 2019
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State two disadvantages that organisms with small surface area to volume ratio
experience over those with larger.
Date posted:
September 30, 2019
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Give the formula used to calculate surface area to volume ratio of an organism.
Date posted:
September 30, 2019
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Give the advantage of using low power magnification instead of high power when viewing specimens under a microscope.
Date posted:
September 30, 2019
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State the importance of egg being larger than sperm in vertebrates.
Date posted:
September 30, 2019
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Give three features in Irish potato tube that qualify it to be a stem tuber.
Date posted:
September 30, 2019
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Name the process which occurs in root hair cells that lead to absorption of water.
Date posted:
September 30, 2019
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A block of metal of mass 250g at 100°C is dropped into a lagged calorimeter of heat capacity 40J/K containing 100g of water at 25°C. The temperature of the resulting mixture was found to be 40°C. Determine; (Cw = 4200J/k)
i) Heat gained by calorimeter.
ii) Heat gained by water.
iii) Heat lost by the block.
iv) Specific heat capacity of the metal block.
Date posted:
September 30, 2019
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Describe how various endo-parasites are adapted for survival in their hosts.
Date posted:
September 30, 2019
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Giving examples differentiate between ecto-parasites and endo-parasites.
Date posted:
September 30, 2019
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Outline the ‘line of sight’ principle in wireless transmission.
Date posted:
September 30, 2019
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Quantity of Urine passed per day was established in five mammals A, B, C, D and E of the same species in their natural habitats. The results are shown below.
(i) Which of the five Mammals was likely to be excreting Urine very rich in ammonia? Give a reason.
(ii) Which of the five mammals was likely to be living in a desert? Give a reason.
(iii) State two structural differences expected in the nephrons of mammals And D.
(iv) State how antidiuretic hormone (ADH) affect the amount of Urine produced by a mammal per day.
Date posted:
September 30, 2019
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How is High pressure achieved in the kidney?
Date posted:
September 30, 2019
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State the principal requirement of filtration that forms glomeruli filtrate.
Date posted:
September 30, 2019
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In an experiment, it was observed that soapy water placed on a wet smooth surface displaced the particles of non-soapy water. Sate and explain this observation.
Date posted:
September 30, 2019
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Give one reason why a lift pump raises water to heights less than 10m.
Date posted:
September 30, 2019
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State the advantages of the cell protoplasm being colloidal in nature.
Date posted:
September 30, 2019
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A mass of 80kg is being lifted by a force F applied on the other piston of the machine as shown in the figure below.Determine the value of F needed to just lift the 80kg mass given the density of the liquid is 1.2g/cm³.
Date posted:
September 30, 2019
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State two ways by which mammalian blood carry out homeostasis function.
Date posted:
September 30, 2019
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The figure below shows a drop of fatty acid on a wire of diameter 1.4mm
When the drop of the fatty acid was placed on clean water surface it formed a circular patch of diameter 91cm.
i) Estimate the length of the molecule of the fatty acid.
ii) State the assumption made in part (i) above.
Date posted:
September 30, 2019
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The organelle below is important in the process of Nutrition.
a) Identify the organelle
b) Name the parts labeled
c)Name the part where the following stages of photosynthesis occur
d)State the role of light in the processes of photosynthesis
Date posted:
September 30, 2019
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Explain the following terms as used in computing cycle.
(i) Fetch phase
(ii) Decode phase
(iii) Execution phase.
Date posted:
September 30, 2019
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A potential mother of blood group B- requires a blood transfusion before her first pregnancy, what blood group(s) can she receive safely if the husband is of Rh+ ve blood. Explain your answer.
Date posted:
September 30, 2019
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Evolutionary changes take place in a population to maintain a balanced community, basing your answer on blood transfusion, explain the role played by nature on distribution of;
(i) Blood group O
(ii) Blood group AB in the population
Date posted:
September 30, 2019
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The table below shows the approximate distribution of human blood groups in a sample of 100 people in a population.
Calculate the percentage of Rhesus negative (Rh -) in the whole group of donors.
Date posted:
September 30, 2019
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The arrangement in the figure below was used to determine the specific heat capacity of the metal.
State the precautions that need to be taken.
Date posted:
September 30, 2019
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Differentiate between Chemotropism and Phototropism.
Date posted:
September 30, 2019
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A boy poured some boiling water into a plastic can and placed an air-tight cork on its open end. He then ran some cold water on it for about 20 seconds after which he shook the can vigorously. State and explain what he observed.
Date posted:
September 30, 2019