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Biology Paper. Question Paper

Biology Paper.

Course:Secondary Level

Exam Year:2008

Instructions:Answer all the questions. 1.Distinguish between a simple reflex and a conditional reflex.(2mks) 2.Give two differences between nervous and hormonal communication.(2mks) 3.In garden peas plants,the gene for purple flowers is dominant to the gene for white colour.A pure breeding pea plant with purple flowers was crossed with a heterozygous plant.a)i)Using letter B to represent the gene for purple colour,work out the genotypic ratio of the offsprings.(5mks) ii)State the phenotype of the offsprings.(1mk) b)What is meant by the following terms:i)Biotechnology ii)GMO's (2mks) 4.Give a reason why only one sperm fertilizes the ovum.(2mks) 5.In an experiment, a leaf from a plant which had been kept in the dark overnight war boiled in the water for a minute,boiled in alcohol and washed in water.Iodine solution was added onto the leaf.a)Explain why the leaf was boiled in:i)water.(2mks) ii)alcohol.(2mks) 6.Describe the adaptations of the ileum to its functions.(10mks) 7.Explain how abiotic factors affect plants.(10mks) 8.Name the part of the brain responsible for:i)Maintaining balance and right position of the body.(1mk) ii)Control respiration,digestion and blood circulation.(1mk) iii)Integration of impulses from eyes,ears and nose.(1mk) 9.Identify each of the following responses:a)A person coughs whenever a foreign body irritates the respiratory system.(1mk) b)When a bell is rang a dog is presented with a meat meal,After several days of practice the dog salivates once the bell is rang even when food is not made available.(1mk)

Biology Paper. Question Paper

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