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Biology 2009 WAEC Past Questions

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61

(a) Explain why an athlete in a race would be given a glucose drink rather than a piece of bread.

(b) Outline the test for starch in a given food substance.

(c) State five reasons why water is important in human diet. 
 

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62

 (a) What is meant by the term Food chain?

(b) Draw a food chain involving four trophic levels which can be found in a terrestrial habitat.

(c) Explain
(i) the flow of energy through the food chain drawn in (b) above;
(ii) how energy in the chain is lost to the environment.

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63

 (a) What is variation?

(b) State five advantages of variation within a species.

(c) In a tabular form, outline four differences between continuous and discontinuous variations.

(d) Explain the following terms:
(i) Sex-linked characters
(ii) Co-dominance
(iii) Hybrid vigour  

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64

(a) With the aid of annotated diagrams only, outline the water cycle.

(b) Describe an experiment to show that water is conducted in the xylem tissue of flowering plants.

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65

(a) What is growth?

(b) State two differences each between;
(i) growth in plants and animals
(ii) metamorphosis in housefly and toad.

(c) Name two hormones each involved in:
(i) plant growth
(ii) animal growth.

(d) State the effects of the hormones named in (c) above.

(e) Name the type of germination which takes place in:
(i) monocotyledonous plants
(ii) dicotyledonous plants.

(f) In a tabular form state four differences between the forms of germination named in (e) above. 

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