a)
Y-sweat pore
X-Eractor pili muscles
b) W- produces sebum which keeps the skin supple/ antiseptic
Z- Secrets sweat which evaporates to bring about cooling/sweat also removes excretory products/excess salts/water
(c) vasoconstriction; hence less blood flows to the skin surface;reducing heat loss;no sweating;heat produced through out metabolisms/shivering;heat is retained in the body
marto answered the question on September 17, 2019 at 06:38
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The diagram below shows a flow chart of blood clotting mechanism in a human.
(Solved)
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.
(Solved)
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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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 flow diagram below represents passage of a meal through the human digestive system. Study the diagram and answer the questions that follow.
(Solved)
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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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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An experiment shown below was a set up to investigate a certain physiological process in plants.
(Solved)
An experiment shown below was a set up to investigate a certain physiological process in plants.
a) What process was being investigated? (1 mark)
b) What effect will the following have on the observation made in (a) above?
i) Fanning the shoot
ii) Removing all the leaves from the shoot.
iii) Placing the set up in the dark.
Date posted:
September 17, 2019
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Answers (1)
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The following diagram of a leaf shows what happens in a plant leaf during photosynthesis.
(Solved)
The following diagram of a leaf shows what happens in a plant leaf during photosynthesis.
(a) State two ways in which leaves are adapted to absorb light.
(b) Name the gases labeled x and y.
(c) Name the tissues that transports:-
(i) Water into the leaf.
(ii) Sugar to other parts of the plant.
(d) Explain why it is an advantage for the plant to store carbohydrates as starch rather than as sugars.
Date posted:
September 16, 2019
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Answers (1)
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The apparatus below illustrate breathing in a mammal.
(Solved)
The apparatus below illustrate breathing in a mammal.
(a) Describe what happens if the rubber plug is pulled in the direction shown by the arrow.
(b) Give the parts of mammal represented by:-
(i) Capillarity tube.
(ii) Rubber plug.
Date posted:
September 16, 2019
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Answers (1)
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Explain how dioecism prevent self-pollination
(Solved)
Explain how dioecism prevent self-pollination
Date posted:
September 16, 2019
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Answers (1)
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A student observed a row of 16 epidermal cells in a microscopic field that was 8mm in diameter. Calculate the average length of each cell...
(Solved)
A student observed a row of 16 epidermal cells in a microscopic field that was 8mm in diameter. Calculate the average length of each cell in micrometers.
Date posted:
September 16, 2019
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Answers (1)
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A scientific space craft brought some material to earth from the outer space. Explain how one would establish if the material is living or non-living.
(Solved)
A scientific space craft brought some material to earth from the outer space. Explain how one would establish if the material is living or non-living.
Date posted:
September 16, 2019
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Answers (1)
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The diagram below represents three types of neurons found in a mammalian body.
(Solved)
The diagram below represents three types of neurons found in a mammalian body.
(a) Name the neurons X, Y and Z
(b) Name the chemical substance responsible for the transmission of an impulse across the gap labelled W.
(c) State two functions of the part labelled M.
(d) In which part of the spinal cord is neurone Y located?
(e) Using arrows indicate on the diagrams the direction followed by nerve impulse leading to a response.
Date posted:
September 16, 2019
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Answers (1)
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Below is a diagram of a plant a form three student collected while carrying out an ecological study
(Solved)
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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Answers (1)
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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...
(Solved)
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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Answers (1)
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The diagram below represents a simple endocrine feedback mechanism in a human male.
(Solved)
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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Answers (1)
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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...
(Solved)
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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Answers (1)
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Name the division of the Kingdom plantae with the following spore producing bodies.
(i) Sori
(ii) Capsule
(Solved)
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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Answers (1)
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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...
(Solved)
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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Answers (1)
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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...
(Solved)
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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Answers (1)
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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...
(Solved)
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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Answers (1)