WAEC 2025 Biology | Essay

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Question 1 View Details
ESSAY SECTION A
Question Parts
(a)
Explain briefly the term excretion
(b)
Name two excretory products each of:
(c)
Complete the table below:\n\(\begin{array}{|l|l|l|l|}\hline \text{Organism} & \text{Excretory structure} & \text{Mechanism involved excretion} & \text{Adaptation in of the structure for excretion} \\\\ \hline \text{Paramecium} & & & \\\\ \hline \text{Planaria} & & & \\\\ \hline \text{Leaf of plant} & & \text{Transpiration} & \\\\ \hline \text{earthworm} & & & \\\\ \hline \end{array}\)
(d)
State three functions of the kidney in humans.
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Question 2 View Details
Question Parts
(a)
State two differences between photosynthetic mode of nutrition and chemosynthetic mode of nutrition.\n\(\begin{array}{|l|l|}\\ \hline \text{Photosynthetic nutrition} & \text{Chemosynthetic nutrition} \\\\ \hline & \\\\ \hline & \\\\ \hline \end{array}\)
(b)
i) What are saprophytes?
(b)
ii) Give two examples of saprophytic organisms.
(b)
iii) Explain briefly the mode of feeding in saprophytes.
(b)
iv) State three ways by which saprophytes are of economic importance.
(c)
State three characteristics features of carnivorous plants.
(d)
State the feeding habit of:\n(i) butterfly;\n(ii) mosquito larva;\n(iii) mucor;\n(iv) housefly
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Question 3 View Details
Question Parts
(a)
Explain briefly how carbon (IV) oxide and oxygen are balanced in nature.
(b)
List five factors that affect the distribution of plants in their habitats.
(c)
i) What is overcrowding in an ecosystem?
(c)
ii) List five effects of overcrowding in an ecosystem.
(d)
i) Distinguish between density-dependent factors in an ecosystem.
(d)
ii) Give two examples of density-dependent factors.
(d)
iii) Explain briefly how density-dependent factors and density-independent factors affect the dynamic equilibrium in an ecosystem.
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Question 4 View Details
Question Parts
(a)
(i) State two factors that could be responsible for the height of their child.
(a)
ii) With the aid of a genetic diagram, give the genotypes of the offspring if the allele for tallness is T.
(a)
iii) Give the genotype of the child that is short.
(b)
i) Define the term genotype.
(b)
ii) List two factors that could cause variation in a character within the same species.
(c)
(i) Define the term allele.
(c)
(ii) State two differences between genotype and phenotype.\n\(\begin{array}{|l|l|}\\ \hline \text{Genotype} & \text{Phenotype} \\\\ \hline & \\\\ \hline & \\\\ \hline \end{array}\)
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Question 5 View Details
Question Parts
(a)
State five effects of high temperature on organisms in their habitats.
(b)
Mention five effects of bush burning on the ecosystem.
(c)
State four roles of the World Health Organization in the control of pandemic diseases.
(d)
(i) Explain briefly countershading as an adaptive feature of Tilapia in freshwater habitats.
(d)
ii) Explain briefly seasonal migration in birds.
(e)
Name:\n(i) five groups of microorganisms; (ii) two groups among the groups named in 5c(i) which have members that are pathogenic.
(f)
A patient with blood group Q requires blood transfusion.\n(i) Name two blood groups that the patient should not be transfused with. (ii) State two likely effects that the transfusion of any of the blood groups named in 5f(i) would have on the patient.
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