a) A-Nitrification
D- absorption
b) Denitrificants/ denitrifying bacteria;
c) Nitrites
d) i) Leguminous plants; acc legumes;
ii) Root nodules
e) Causes death of nitrogen fixing bacteria; hence no nitrogen fixation;
sharon kalunda answered the question on September 17, 2019 at 12:12
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In humans haemophilia is caused by a recessive gene. A man whose mother was hemophiliac marries a normal woman whose father was hemophiliac let H...
(Solved)
In humans haemophilia is caused by a recessive gene. A man whose mother was hemophiliac marries a normal woman whose father was hemophiliac let H represent dominant gene.
a) Define the term recessive gene.
b) What is the possible genotype of the woman?
ii) Using punnet square work out the genotype of the first filial generation. Show your working.
c) i) What is the probability of the daughter being haemophilic?
ii) State one advantage of mutation to plants.
Date posted:
September 17, 2019
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Answers (1)
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Active yeast cells were added to dilute sugar solution in a container. The mixture was left in a warm room. After a few hour bubbles...
(Solved)
Active yeast cells were added to dilute sugar solution in a container. The mixture was left in a warm room. After a few hour bubbles of gases were observed escaping from the mixture.
a) Write an equation to represent the chemical process
b) What is the importance of the type of reaction in industries?
Date posted:
September 17, 2019
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Answers (1)
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Complete the table below for mineral nutrients in plants.
(Solved)
Complete the table below for mineral nutrients in plants.
Date posted:
September 17, 2019
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Answers (1)
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The diagram below represents a bone in a mammal.
(Solved)
The diagram below represents a bone in a mammal.
a) Identify the bone.
b) Name the bone that articulate with the above bone at part A.
c) Name the joint formed at the part labeled B.
Date posted:
September 17, 2019
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Answers (1)
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The diagram below illustrates part of a human skin.
(Solved)
The diagram below illustrates part of a human skin.
a) State the function of each of the part labeled A.
b) State the actions of each of the following parts when the body temperatures fall below the normal.
i) Part B
ii) Part C
c) How does the part labeled D help in osmoregulation.
d) Explain one biological mechanism through which the skin offers protection to the body.
Date posted:
September 17, 2019
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Answers (1)
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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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The following chart illustrates the quantity of urine passed out by three animals of different species in different habitat.
(Solved)
The following chart illustrates the quantity of urine passed out by three animals of different species in different habitat.
a) Name the forms in which the following organisms are likely to excrete their nitrogenous wastes.
Animal B
Animal C
b) Give two structural modification of the animal B that enables it to survive in its habitat.
Date posted:
September 17, 2019
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Answers (1)
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The diagram below represents the urinary system of a mammal. Study it carefully and answer the questions that follow.
(Solved)
The diagram below represents the urinary system of a mammal. Study it carefully and answer the questions that follow.
a) Name the parts labeled C, D and E.
b) i) Identify the part labeled A.
ii) State the hormone produced by the part you have identified in b(i) above and its function.
c) Which of the blood vessels (B and F) contains:
i) A higher concentration of urea.
ii) Lower concentration of oxygen.
d) State how the nephrons of desert mammals are structurally adapted.
Date posted:
September 17, 2019
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Answers (1)
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Study the photographs labeled K and L which were obtained from the same plant.
(Solved)
Study the photographs labeled K and L which were obtained from the same plant.
i) Identify the sub-division to which they belong.
ii) Give reasons for your answer.
iii) Identify the reproductive structure represented in K and L.
Date posted:
September 17, 2019
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Answers (1)
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Which part of the brain regulates body temperatures in mammals?.
(Solved)
Which part of the brain regulates body temperatures in mammals?.
Date posted:
September 17, 2019
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Answers (1)
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The diagram below represents a human arm. Study it and answer the questions that follow.
(Solved)
The diagram below represents a human arm. Study it and answer the questions that follow.
a) Name bone T and R
b) Name muscle C and D
c) i) Identify the fluid found at joint 2.
i) State the function of the fluid in (i) above.
d) i) What is the type of the joint found at part labeled 1.
ii) Differentiate between a tendon and a ligament.
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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Plants with red flowers were crossed with plants with white flowers. The resultant F1 generation had pink flowers.
(Solved)
Plants with red flowers were crossed with plants with white flowers. The resultant F1 generation had pink flowers.Plants with red flowers were crossed with plants with white flowers. The resultant F1 generation had pink flowers.
a) Using R for red flowers and W for white flowers, work out the genotypes of F2 generation.
b) Determine the genotypic ratio of F2 generation.
c) Explain why a cross between red flowered plants and white flowered plants produced pink flowers.
d) If the total number of F2 generation offsprings was 7324. Calculate the number of red flowered plants.
Date posted:
September 17, 2019
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Answers (1)
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Red blood cells from a rabbit were placed in a petri dish containing a certain solution. A drop from the petri dish was then mounted...
(Solved)
Red blood cells from a rabbit were placed in a petri dish containing a certain solution. A drop from the petri dish was then mounted on a slide and observed under a light microscope after 20 minutes.He made the drawings below.
a) Name solution Y
b) What term is to is describe the process that took place.
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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During a field study, a student at Muringa secondary school collected a certain organisms whose actual length was four centimeters. He made a drawing of...
(Solved)
During a field study, a student at Muringa secondary school collected a certain organisms whose actual length was four centimeters. He made a drawing of the organism whose length was 12cm. Calculate the magnification of the drawing.
Date posted:
September 17, 2019
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Answers (1)
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Identify the type of immunity given When a young child suffers from measles and recovers from it.
(Solved)
Identify the type of immunity given When a young child suffers from measles and recovers from it.
Date posted:
September 17, 2019
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Answers (1)
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Identify the type of immunity given When a baby obtains antibodies through breastfeeding.
(Solved)
Identify the type of immunity given When a baby obtains antibodies through breastfeeding.
Date posted:
September 17, 2019
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Answers (1)
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State the difference between a cell wall and a cell membrane.
(Solved)
State the difference between a cell wall and a cell membrane.
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)