- Use of unsterilized instrument.
- Blood transfusion using blood contaminated with the virus
- Mother to the foetus or mother to baby or infant through breast milk if the mother is infected.
- Sharing of instrument e.g. needles syringes, razor blade
- Mixing of infected blood through cuts
johnmulu answered the question on May 8, 2017 at 07:55
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Give two reasons why primary productivity in an aquatic ecosystem decreases with depth.
(Solved)
Give two reasons why primary productivity in an aquatic ecosystem decreases with depth.
Date posted:
May 8, 2017
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Answers (1)
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What is the relationship between leguminous plants and bacteria found in their root nodules?
(Solved)
What is the relationship between leguminous plants and bacteria found in their root nodules?
Date posted:
May 8, 2017
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Answers (1)
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What is parasitism?
(Solved)
What is parasitism?
Date posted:
May 8, 2017
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Answers (1)
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The diagram below represents a simplified nitrogen cycle
(Solved)
The diagram below represents a simplified nitrogen cycle
(a) Name the organisms that cause process E and J
(b) Name the process represented by F and H.
(c) Name the group of organism represented by G.
Date posted:
May 8, 2017
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Answers (1)
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The diagram below represents a feeding relationship in an ecosystem
(Solved)
The diagram below represents a feeding relationship in an ecosystem
(a) Write down the food chains in which the guinea fowls are secondary consumers.
(b) What would be the short term effects on the ecosystem if lions invaded the area?
(c) Name the organism through which energy from the sun enters the food web
Date posted:
May 8, 2017
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Answers (1)
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Oil can be applied on the stagnant water to control the spread of malaria.
(Solved)
Oil can be applied on the stagnant water to control the spread of malaria.
(a) How does this practice control the spread of malaria?
(b) Give a reason why this practice should be discouraged.
Date posted:
May 8, 2017
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Answers (1)
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Describe how the quadrant method can be used to estimate the population of various species of plants in a given habitat.
(Solved)
Describe how the quadrant method can be used to estimate the population of various species of plants in a given habitat.
Date posted:
May 8, 2017
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Answers (1)
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The chart below shows a feeding relationship in a certain ecosystem
(Solved)
The chart below shows a feeding relationship in a certain ecosystem
(a) Construct two food chains ending with a tertiary consumer in each case.
(b) Which organism has the largest variety of predators in the food web?
(c) Name secondary consumers in the food web
(d)Suggest three ways in which the ecosystem would be affected if there was prolonged drought.
Date posted:
May 8, 2017
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Answers (1)
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State three characteristics of the class Crustacea
(Solved)
State three characteristics of the class Crustacea
Date posted:
May 8, 2017
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Answers (1)
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(a) What is meant by the term binomial nomenclature?
(b) State two guidelines that should be followed when typing scientific names.
(Solved)
(a) What is meant by the term binomial nomenclature?
(b) State two guidelines that should be followed when typing scientific names.
Date posted:
May 8, 2017
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Answers (1)
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The diagram below represents a member of the kingdom Animalia.
(Solved)
The diagram below represents a member of the kingdom Animalia.
(i) Name the phylum to which the organism belongs.
(ii) Using observable features in the diagram, give three reasons for the answer in b (i)
Date posted:
May 8, 2017
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Answers (1)
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The diagram below represents a plant in the division Bryophyta.
(Solved)
The diagram below represents a plant in the division Bryophyta.
(i) Name the parts labelled B and D
(ii) State one function for each of the parts labeled A and C.
Date posted:
May 8, 2017
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Answers (1)
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State two characteristics of living organisms that are specific to plants.
(Solved)
State two characteristics of living organisms that are specific to plants.
Date posted:
May 8, 2017
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Answers (1)
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(a) A student collected an organism and observed the following features:
(Solved)
(a) A student collected an organism and observed the following features: Simple eyes, four pairs of legs and two body parts.
(i) State the class to which the organism belongs
(ii) Give an example of an organism in this class
(b) Name the kingdom to which plasmodium belongs
Date posted:
May 8, 2017
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Answers (1)
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Construct a step in a dichotomous key using two leaves on with a serrated and the other with a smooth margin
(Solved)
Construct a step in a dichotomous key using two leaves on with a serrated and the other with a smooth margin
Date posted:
May 8, 2017
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Answers (1)
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(a) State two external features found in the class Mammalia only.
(b) Name the taxonomic unit that comes immediately after a phylum in classification.
(Solved)
(a) State two external features found in the class Mammalia only.
(b) Name the taxonomic unit that comes immediately after a phylum in classification.
Date posted:
May 8, 2017
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Answers (1)
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The diagram below represents a certain organism collected by a student at the sea shore.
(Solved)
The diagram below represents a certain organism collected by a student at the sea shore.
(a) Name the class to which the organisms belongs.
(b) Give three reasons for your answer in (a) above.
Date posted:
May 8, 2017
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Answers (1)
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The diagram below represents a certain organism.
(Solved)
The diagram below represents a certain organism.
State the phylum and class to which it belongs
Date posted:
May 8, 2017
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Answers (1)
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The diagram below illustrates the organs of some flowering plants.
(Solved)
The diagram below illustrates the organs of some flowering plants.
State the classes of plants to which each belong.
Date posted:
May 8, 2017
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Answers (1)
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State three characteristics of the class Crustacea.
(Solved)
State three characteristics of the class Crustacea.
Date posted:
May 8, 2017
.
Answers (1)