Free WAEC Biology Theory Past Questions

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.

(a) List the four main components of blood that would be in the test tube.

(b) Name the components of the blood that:

(i) Would form the top layer in the test tube

(ii) Destroys pathogens

(iii) Is bi-concave in shape

(iv) Would be relatively  low in a haemophilic condition

(v) Is produced in the bone marrow

(vi) Is a thrombocyte

(vii) Is nucleated

(c) Mention three chemical substances transported by the blood component named in 1(b)(i)

(d) List four diseases associated with blood.

(e) Explain briefly why a disease of the blood could be dangerous.

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a.(i) State three differences between the alimentary canals of earthworm and cockroach.

(ii) State three similarities between the alimentary canals of earthworm and cockroach.

b. The diagram below is an illustration of a biological cycle.

Study it and answer questions 5(b)i) to 5(b)(iii)

(i) Name the biological cycle
(ii) Explain briefly three roles played by plants and animals in the cycle
(iii) Name the processes that occur in X, Y and Z.

c. Complete the table below.

	Organ associated with excretion in humans	Three diseases each that affect the organ
1.
2.

d. (i) What is decay of organic matter.
(ii) Name two groups of organisms that cause decay of organic matter.
(iii) State one other factor that causes decay.
(iv) Name the biological cycle that involves decay.

e. Explain briefly the mode of nutrition in carnivorous plants.

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