To prevent entry of further spermatozoa;
To protect the zygote;
sharon kalunda answered the question on September 13, 2019 at 11:11
- A student was using a microscope whose eyepiece lens was marked X4. The high powered objective lenses were marked X10. Calculate the total magnification of...(Solved)
A student was using a microscope whose eyepiece lens was marked X4. The high powered objective lenses were marked X10. Calculate the total magnification of the microscope
Date posted: September 13, 2019. Answers (1)
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Distinguish between Attenuation and Vaccination?
Date posted: September 13, 2019. Answers (1)
- The diagrams below illustrate some chromosome mutations.(Solved)
The diagrams below illustrate some chromosome mutations.
(a) Identify the mutations illustrated above.
(b) Give an example of a disorder in humans caused by mutation A above.
Date posted: September 13, 2019. Answers (1)
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Give an example of a beneficial mutation in plants.
Date posted: September 13, 2019. Answers (1)
- (a) In which organ is cardiac muscle found.
(b) What is the function of the cardiac muscle in the organ you have named in (a)...(Solved)
(a) In which organ is cardiac muscle found.
(b) What is the function of the cardiac muscle in the organ you have named in (a) above.
Date posted: September 13, 2019. Answers (1)
- (a) Given a sample of urine, name one test you would carry out to determine if it was obtained from a person suffering from diabetes...(Solved)
(a) Given a sample of urine, name one test you would carry out to determine if it was obtained from a person suffering from diabetes mellitus.
(b) What results are expected if one is diabetic?
Date posted: September 13, 2019. Answers (1)
- A goat weighing 20kg requires 216KJ while a mouse weighing 54gms requires 2830KJ per day. Explain.(Solved)
A goat weighing 20kg requires 216KJ while a mouse weighing 54gms requires 2830KJ per day. Explain.
Date posted: September 13, 2019. Answers (1)
- In a prolonged drought period, forage was scarce. It made animals reach out for higher forage and this way the giraffes got the stretched long...(Solved)
In a prolonged drought period, forage was scarce. It made animals reach out for higher forage and this way the giraffes got the stretched long necks.
(a) What is the term used for a characteristic such as the long necks outlined?
(b) What is the name given to the theory that describes the evolution of such structures like the long necks?
(c) State and explain the limitation of the theory you named in (b) above.
Date posted: September 13, 2019. Answers (1)
- The table below shows differences in air breathed in and out.(Solved)
The table below shows differences in air breathed in and out.
What is the reason for there differences.
Date posted: September 13, 2019. Answers (1)
- Which substance in the cigarettes smoke may cause lung cancer.(Solved)
Which substance in the cigarettes smoke may cause lung cancer.
Date posted: September 13, 2019. Answers (1)
- Mr. Juma has sued Serenity Hospital on grounds that their child was wrongly identified such that they got the wrong one.The child is blood group...(Solved)
Mr. Juma has sued Serenity Hospital on grounds that their child was wrongly identified such that they got the wrong one.The child is blood group O. Mr. Juma is blood group AB while Mrs. Juma is heterozygous blood group A.
(a) Work out the possible blood group of their offsprings.
(b) Is Mr. Juma justified in his claims?
Date posted: September 13, 2019. Answers (1)
- The diagram below show single circulation of a fish.(Solved)
The diagram below show single circulation of a fish.
(a) Write down the names of the parts labelled T,U and V.
(b) Explain the main disadvantage of this type of circulation.
(c) How is this type of circulation different from that found in man?
Date posted: September 13, 2019. Answers (1)
- The table below shows approximate numbers of organisms found in an ecosystem.(Solved)
The table below shows approximate numbers of organisms found in an ecosystem.
(a) Using the information in the table draw a pyramid of numbers.
(b) Explain what would happen to the other organisms if all the lizards suddenly died off.
Date posted: September 13, 2019. Answers (1)
- The photographs labelled K, L, M, N and P below are bones obtained from a mammal. For each of the bones K, L and M,...(Solved)
The photographs labelled K, L, M, N and P below are bones obtained from a mammal. For each of the bones K, L and M, two views are shown.
(a) Identify the bones and name the part of the mammalian body from which each was obtained. (5mks)
(b) Name the parts labelled 1, 2 and 4.
(c) Name the bones that form a joint with bone K at its anterior and posterior end
and in each case name the type of joint they form.
Anterior end.
(i) Bone(s)
(ii) Type of joint
Posterior end.
(i) Bone(s)
(ii) Type of joint
(d) State the function of the structure labelled 6 in bone P.
Date posted: September 13, 2019. Answers (1)
- Name the hard body covering found in organisms of the phylum arthropoda.(Solved)
Name the hard body covering found in organisms of the phylum arthropoda.
Date posted: September 13, 2019. Answers (1)
- Write the kingdoms to which the following organisms belong.
Plasmodium
Bat
Yeast(Solved)
Write the kingdoms to which the following organisms belong.
Plasmodium
Bat
Yeast
Date posted: September 13, 2019. Answers (1)
- A student collected a plant with the following features:
-Vascular bundles in the stem were scattered with no cambium.
-Fibrous root system.
Name the sub-division and the class...(Solved)
A student collected a plant with the following features:
-Vascular bundles in the stem were scattered with no cambium.
-Fibrous root system.
Name the sub-division and the class to which the above plant belonged.
Sub-division
Class
Date posted: September 13, 2019. Answers (1)
- Name one waste product that is transported in the blood but not removed by the kidneys.(Solved)
Name one waste product that is transported in the blood but not removed by the kidneys.
Date posted: September 13, 2019. Answers (1)
- Arrange the following nitrogenous waste products in order of decreasing toxicity:
urea, uric acid and ammonia.(Solved)
Arrange the following nitrogenous waste products in order of decreasing toxicity:
urea, uric acid and ammonia.
Date posted: September 13, 2019. Answers (1)
- Name two substances that are excreted through diffusion process in plants.(Solved)
Name two substances that are excreted through diffusion process in plants.
Date posted: September 13, 2019. Answers (1)