WAEC 2023 Biology | Essay

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Question 1 View Details
Question Parts
(a)
What is classification of living things?
(b)
State four ways each by which the following groups of organisms are of economic importance in their habitats: (i) Fungi; (ii) plants.
(c)
Complete the table below by stating five major phyla of the Kingdom Animalia and given one example of each. \(\begin{array}{|l|l|} \hline \text{Phyla of Kingdom animalia} & \text{Example} \\ \hline & \\ \hline & \\ \hline & \\ \hline & \\ \hline \end{array}\)
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Question 2 View Details
Question Parts
(a)
Complete the table below \(\begin{array}{|l|l|} \hline \text{Phyla of Kingdom animalia} & \text{Example} \\ \hline & \\ \hline & \\ \hline & \\ \hline & \\ \hline \end{array}\)
(b)
Name three classes of organic foods which are essential constituents in the diet of a normal mammal.
(c)
State two roles each of the following structures of the digestive system in humans: (i) buccal cavity; (ii) duodenum; (iii) stomach
(d)
Name the end product of adding dilute hydrochloric acid to sucrose.
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Question 3 View Details
Relationships I, II, III, IV and V exist among some organisms in an ecosystem. Use them to answer questions 3(a) to 3(e)
Question Parts
(a)
Name the type of relationship in: I: ___ II: ___ III: ___ IV: ___ V. ___
(b)
In relationship IV, what is the biological term for each of organization B and G? (i) B; (ii) G:
(c)
Name one example each of organisms B to J: B: ___ C: ___ D: ___ E: ___ F: ___ G: ___ H: ___ J: ___
(d)
(i) Name the relationship that is most beneficial to the ecosystem. (ii) Give one reason for the answer 3(d)(i)
(e)
(i) Give Two examples of organism A. (ii) Name the group to which organism A belongs
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Question 4 View Details
Question Parts
(a)
Complete the following Punnett squares of a dihybrid cross between two rats. One has black fur (BB) and short tail (tt), the other has brown fur (bb) and long tail (TT). \(\begin{array}{|c|c|c|c|c|} \hline \text{X} & \text{Bt} & & & \\ \hline & & & & \\ \hline \text{bT} & & & & \\ \hline & & & & \\ \hline & & & & \\ \hline \end{array}\)
(b)
How many of the offspring will have: (i) black fur and short tail; (ii) brown fur and long tail; (iii) black fur and long tail; (iv) brown fur and short tail?
(c)
If there were twenty (20) chromosomes in the leaf cell of a plant, how many chromosomes would be in each of the following cells of the plant? (i) pollen grain (ii) guard cell (iii) ovule (iv) root cell
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Question 5 View Details
Answer the questions in this section.
Question Parts
(a)
(i) What are sense organs? (ii) name three sense organs that respond to the stimulus of chemicals.
(b)
List three animals each that exhibit the following courtship behaviors. (i) territoriality (ii) pairing
(c)
(i) State one similarity between the eggs of toads and the eggs of birds. (ii) State three differences between the eggs of toads and the eggs of birds. \begin{array}{|l|l|} \hline \text{Eggs of toads} & \text{Eggs of birds} \\ \hline & \\ \hline & \\ \hline & \\ \hline \end{array}
(d)
Complete the table below by listing four organisms involved in the nitrogen cycle and state one role each of the organisms. \(\begin{array}{|l|l|} \hline \text{Four organisms involved in the nitrogen cycle} & \text{One role of organism} \\ \hline & \\ \hline & \\ \hline & \\ \hline & \\ \hline \end{array}\)
(e)
Complete the table below by naming two types of heterotrophic modes of nutrition in animals and give two examples each of the organisms that carry out the modes of nutrition. \(\begin{array}{|l|l|} \hline \text{Two modes of heterotrophic nutrition} & \text{Two examples of organisms that carry out mode of nutrition} \\ \hline & \\ \hline & \\ \hline & \\ \hline \end{array}\)
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