WAEC 2021 Biology | Essay

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Question 1 View Details
A sample of human blood was put in a test tube and allowed to spin in a centrifuge. The components of the blood sample were clearly separated.
Question Parts
(a)
List the four main components of blood that would be in the test tube.
(b)
Name the component of the blood that:
(c)
Mention three chemical substances transported by the blood component named in 1(b) above.
(d)
List four diseases associated with blood.
(e)
Explain briefly why a disease of the blood could be dangerous.
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Question 2 View Details
Question Parts
(a)
What is dentition in animals?
(b)
Describe briefly the generalised structure of a tooth in animals.
(c)
List three food substances that plants manufacture from glucose.
(d)
Make a diagram, 6 cm to 8 cm long of an experimental set-up to show that oxygen is produced during photosynthesis.
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Question 3 View Details
Complete the table below by placing each of the following organisms under the appropriate heading: Algae, Bacteria, Dog, Water lettuce, Tadpole, Cat, Lemna, Waterleaf, Mucor, Mushroom. \( \begin{array}{|l|l|l|} \hline \text{Decomposer} & \text{Producer} & \text{Consumer} \\ \hline & & \\ \hline & & \\ \hline & & \\ \hline & & \\ \hline \end{array} \)
Question Parts
(a)
Complete the table below by placing each of the following organisms under the appropriate heading.
(b(i))
Name four products of decomposition.
(ii)
Mention three roles of decomposers on a refuse dump.
(c)
List three materials dump which would not be affected by the action of decomposers.
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Question 4 View Details
Complete the table below by naming five wildlife animals in West Africa and one body part each that makes them endangered because of the activities of humans. \( \begin{array}{|l|l|} \hline \text{Animal} & \text{One body part that makes animal endangered} \\ \hline & \\ \hline & \\ \hline & \\ \hline & \\ \hline \end{array} \)
Question Parts
(a)
Complete the table by naming five wildlife animals in West Africa and one body part each that makes them endangered because of the activities of humans.
(b)
State three effects each of the following factors on the conservation of natural resource:
(c)
State four roles played by the Government in conservation of natural resources.
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Question 5 View Details
Question Parts
(a)
Complete the table below by naming the nutrient cycle that involves each of the given processes and give three other processes involved in the nutrient cycle. \(\begin{array}{|l|l|l|} \hline \text{Process} & \text{Nutrient cycle} & \text{Three other processes involved in the named nutrient cycle} \\ \hline \text{Combustion} & & \\ \hline \text{Precipitation} & & \\ \hline \text{Lightning} & & \\ \hline \end{array}\)
(b)
What is irritability?
(ii)
Complete the table below by stating the type of response elicited by each of the given actions.\(\begin{array}{|l|l|} \hline \text{Action} & \text{Type of response} \\ \hline \text{Euglena moving towards source of light} & \\ \hline \text{Opening and closing of Mimosa plant leaves} & \\ \hline \text{Mosquitoes avoiding repellants} & \\ \hline \text{Earthworm moving away from light} & \\ \hline \text{Sperm cell moving towards chemical substances of an ovum} & \\ \hline \text{Four O' Clock plant opening at 4.00 p.m.} & \\ \hline \text{Shoot of bean seedling growing towards sunlight} & \\ \hline \end{array}\)
(c)
Name three animals each that exhibit:
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