-External intercostals muscles contract
-internal intercostals muscle relax; Rib cage move outwards and upwards
-Diaphragm muscles contract; diaphragm flatten
-Volume in thoracic cavity increases; pressure reduces
-Atmospheric air enters the lungs
-lungs inflate.
marto answered the question on September 30, 2019 at 11:31
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A baby who is suckling has a lower chance of contracting infection than one who feeds from the bottle. Explain.
(Solved)
A baby who is suckling has a lower chance of contracting infection than one who feeds from the bottle. Explain.
Date posted:
September 30, 2019
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Answers (1)
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What are the advantages and disadvantages of having blood group O?
(Solved)
What are the advantages and disadvantages of having blood group O?
Date posted:
September 30, 2019
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Answers (1)
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Calculate the respiration quotient (RQ) from the equation below:-
(Solved)
Calculate the respiration quotient (RQ) from the equation below:-
a)
b) Identify the substrate being respired in the above equation
Date posted:
September 30, 2019
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Answers (1)
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The figure below represents a structure obtained from the ileum of a mammal.
(Solved)
The figure below represents a structure obtained from the ileum of a mammal.
a) Give the identity of the structure.
b) What is the importance of the structure named in (a) above?
c) Name the parts labeled A, B and D
Date posted:
September 30, 2019
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Answers (1)
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Name the carbohydrate stored in:
i) Cell wall
ii) Mammalian liver
(Solved)
Name the carbohydrate stored in:
i) Cell wall
ii) Mammalian liver
Date posted:
September 30, 2019
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Answers (1)
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State the type of solution that makes the plant cell.
(Solved)
State the type of solution that makes the plant cell.
i) Flaccid
ii) Turgid
Date posted:
September 30, 2019
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Answers (1)
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A student measured the length of a mitochondrion on a photomicrograph whose magnification was X 40000 and found it to be 1mm. Calculate the actual...
(Solved)
A student measured the length of a mitochondrion on a photomicrograph whose magnification was X 40000 and found it to be 1mm. Calculate the actual size of the mitochondrion.
Date posted:
September 30, 2019
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Answers (1)
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Name one example of the specialized cells in plants and one example in animals.
(i) Plants
(ii) Animals
(Solved)
Name one example of the specialized cells in plants and one example in animals.
(i) Plants
(ii) Animals
Date posted:
September 30, 2019
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Answers (1)
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The equation bellows shows a chemical reaction that takes place in green plants under certain conditions.
(Solved)
The equation bellows shows a chemical reaction that takes place in green plants under certain conditions.
a) Name the
i) Process represented by the equation
ii) Substance represent by X
b) Other than the reactants, state two conditions necessary for this reaction to occur.
c) Name three types of cells in which the process occurs
Date posted:
September 30, 2019
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Answers (1)
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Two herbivorous mammal species were introduced into an ecosystem at the same time and in equal numbers. The graph below represents their populations during the...
(Solved)
Two herbivorous mammal species were introduced into an ecosystem at the same time and in equal numbers. The graph below represents their populations during the first seven years. Study the graph and answer the questions that follow.
(a) (i) Which species has a better competitive ability?
(ii) Give a reason for your answer.
(b) Account for the shape of the curve for spicies A between;
(i) One year and three years
(ii) 4 years and eight years.
(c) A natural predator of species A was introduced into the ecosystem. With a reason, state how the
population of each species would be affected?
(d) State four other biotic factors of the ecosystem which affects organisms distribution in their habitat other than the one illustrated in the above graph.
(e) Name the instruments used to measure the following;
(i) Light intensity.
(ii) Light penetration in water.
(iii) Speed of wind.
(iv) Atmospheric pressure
Date posted:
September 30, 2019
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Answers (1)
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(a) Name two substances transported in blood plasma.
(i)
(ii)
(b) Wanjiru is blood group A.
(i) Name an antibody found in her blood plasma.
(ii) Name...
(Solved)
(a) Name two substances transported in blood plasma.
(i)
(ii)
(b) Wanjiru is blood group A.
(i) Name an antibody found in her blood plasma.
(ii) Name an antigen found in her red blood cell.
(iii) Name the blood groups she can donate to
Blood groups-
(i)
(ii)
(c) What is meant by the term allergy?
(d) Name one substance that can cause allergy
Date posted:
September 30, 2019
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Answers (1)
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The diagram below represents two process underwent by a plant cell.
(Solved)
The diagram below represents two process underwent by a plant cell.
(a) Identify process X
(b) Name the state of the cell after undergoing process
(i) X.
(ii) Z .
(c) Name the substance which is found in parts labelled;
(i) P.
(ii) Y .
(d) Name parts labelled M and Q.
(e) Name the cell organelle which is usually referred to as 'cell’s kitchen'.
Date posted:
September 30, 2019
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Answers (1)
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In an experiment to analyze a 200cm3 sample of air was treated with pyrogallic acid. This reduced its volume to 168cm3. Potassium hydroxide was then...
(Solved)
In an experiment to analyze a 200cm3 sample of air was treated with pyrogallic acid. This reduced its volume to 168cm3. Potassium hydroxide was then added and the volume of gas reduced further to 160cm3.
(a) What was the role of pyrogallic acid?
(b) What was the role of potassium hydroxide?
(c) Calculate the percentage of oxygen and percentage of carbon (iv) oxide in the sample
(d) Suggest the likely biological source of carbon (iv)oxide gas.
(e) State the behavior of external intercostal muscles during exhalation.
(f) Explain why smokers are more prone to respiratory tract infections than the non- smokers
Date posted:
September 30, 2019
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Answers (1)
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The following diagram shows a cell at a certain stage of cell division.
(Solved)
The following diagram shows a cell at a certain stage of cell division.
a) Name the type and stage of cell division.
Type
Stage
(b) (i) Give one reason for your answer in (a) above
(ii) What is the significance of the process shown in the diagram above in relation to the
behavior of chromosomes?
(c) What is the general name of organs where the above process occurs?
(d) Name the part labeled;
C
F
(e) State the significance of part labeled A in relation to the process shown above ?
(f) Name one cell in plants which is haploid
Date posted:
September 30, 2019
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Answers (1)
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The diagram below represents a nitrogen cycle. (a) Name the groups of organism represented by J.....
(Solved)
The diagram below represents a nitrogen cycle.
(a) Name the groups of organism represented by J.
(b) Name the process represented by R,P,M and N.
(c) Name one process represented by T.
(d) (i) Name a structure in roots involved in process M.
(ii) State one adaptation of the structure named in d (i) above to its function
Date posted:
September 30, 2019
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Answers (1)
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The diagram below shows a stage of a certain type of cell division.
(Solved)
The diagram below shows a stage of a certain type of cell division.
a) Identify the stage and type of the cell division the above cell is undergoing.
b) State two importance of the above type of cell division
Date posted:
September 30, 2019
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Answers (1)
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In a capture-recapture exercise to estimate population size of dragon flies on a stretch of rivers, 250flies were first caught and marked. Two days later...
(Solved)
In a capture-recapture exercise to estimate population size of dragon flies on a stretch of rivers, 250flies were first caught and marked. Two days later 500 flies were caught in the second capture and out of this, 50 flies had marks on their bodies. Estimate the population size of the flies. (show your working)
Date posted:
September 30, 2019
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Answers (1)
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Explain the following Phenomena “Stomata generally open during the day and close at night”.
(Solved)
Explain the following Phenomena “Stomata generally open during the day and close at night”.
Date posted:
September 30, 2019
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Answers (1)
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State four behavioural pattern or activities shown by terrestrial animals to their adaptations in habitats.
(Solved)
State four behavioural pattern or activities shown by terrestrial animals to their adaptations in habitats.
Date posted:
September 30, 2019
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Answers (1)
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Pregnancy would persist after the expiry of the fifth month of pregnancy even if the two ovaries are surgically removed from the body of female...
(Solved)
Pregnancy would persist after the expiry of the fifth month of pregnancy even if the two ovaries are surgically removed from the body of female individual. Give an account for this.
Date posted:
September 30, 2019
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Answers (1)