Ecology.
sharon kalunda answered the question on September 17, 2019 at 07:16
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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
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Answers (1)
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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
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Answers (1)
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Photographs below represent specimen taken from three species of plants.
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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
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Answers (1)
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The set apparatus was assembled by a group of students to investigate some physiological process.
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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
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Answers (1)
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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
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Answers (1)
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The diagram below represents a neurone.
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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
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Answers (1)
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Give two reasons why the evolution of human enabled him to survive better than his hominid ancestors.
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Give two reasons why the evolution of human enabled him to survive better than his hominid ancestors.
Date posted:
September 17, 2019
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Answers (1)
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The diagram below shows a section through the mammalian skin.
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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
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Answers (1)
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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
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Answers (1)
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The diagram below shows a flow chart of blood clotting mechanism in a human.
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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
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Answers (1)
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The diagram below represents the vertical section of a fruit.
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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
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Answers (1)
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Using the table below, answer the questions that follow.
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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
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Answers (1)
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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
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Answers (1)
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The figures below illustrate specialized cells in an animal body.
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The figures below illustrate specialized cells in an animal body.
a) Identify the cell M and N.
b) State the structural differences between M and N
c) Which of the above specialized cells is found in the gut.
Date posted:
September 17, 2019
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Answers (1)
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Examine the diagram below and answer the questions that follows.
(Solved)
Examine the diagram below and answer the questions that follows.
A...............................
B................................
C.....................................
D....................................
b) State the type of germination exhibited by the seedling above
c) State and explain three environmental conditions necessary for germination.
Date posted:
September 17, 2019
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Answers (1)
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The diagram below represents a pyramid of biomass derived from certain Ecosystem.
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The diagram below represents a pyramid of biomass derived from certain Ecosystem.
a) Suggest the type of ecosystem from which the pyramid was derived.
b) State the significance of short food chains is an ecosystem.
Date posted:
September 17, 2019
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Answers (1)
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The flow diagram below represents passage of a meal through the human digestive system. Study the diagram and answer the questions that follow.
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The flow diagram below represents passage of a meal through the human digestive system. Study the diagram and answer the questions that follow.
(a) Name the physical process that will occur in mouth cavity
(b) Name the digestive juices B and C
B...........................
C...........................
(c) Explain two ways in which the digestive system is protected from corrosive effects of digestive juices.
(d) Name the hormone that stimulate secretion of juice B.
(e) Identify two contents of digestive juice A
Date posted:
September 17, 2019
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Answers (1)
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The table below shows the percentage composition of carbon (iv) oxide and oxygen in inhaled and exhaled air,
(Solved)
The table below shows the percentage composition of carbon (iv) oxide and oxygen in inhaled and exhaled air,
Explain the differences in percentage of the two gases in inhaled and exhaled air.
a) Oxygen
b) Carbon (Iv) oxide
Date posted:
September 17, 2019
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Answers (1)
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Name the source of hydrochloric acid in the mammalian stomach.
(Solved)
Name the source of hydrochloric acid in the mammalian stomach.
Date posted:
September 17, 2019
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Answers (1)
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The diagram below shows the structure of a human ear.
(Solved)
The diagram below shows the structure of a human ear.
a. State functions of human ear
b. Give the name of structures labeled C, G. F
c. What is the function of the structure labeled H
Date posted:
September 17, 2019
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Answers (1)