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Biology Form 4 Question Paper

Biology Form 4

Course:Secondary Level

Exam Year:2009

Instructions:Answer all the questions. 1.a)What is cell specialisation?(2mks) b)State three examples of specialised cells and how they are specialised to carry out their functions.(3mks) 2.Give two reasons why accumulation of lactic acid during vigorous exercise lead to an increase in heart beat.(2mks) 3.A leaf of a growing plant which had been covered with a black polythene paper was smeared with vaselene jelly on its lower surface,it was then exposed to sunlight for six hours,starch test on the leaf was negative.Explain the observations.(3mks) 4.a)What do you understand by the term accomodation in relation to human eye.(1mk) b)Name three parts of the eye that bring about accomodation.(3mks) 5.State three roles played by the bark in plants.(3mks) 6.a)State the significance of mitosis to an organism.(1mk) b)Name two regions in higher plants where cells actively undergo mitosis.(2mks) 7.Explain the photosynthesis theory of opening and closing of stomata.(10mks) 8.Members of the same species of organisms tend to differ due to variation,state four causes of variation in organisms.(4mks) 9.Differentiate between essential and non essential Amino Acids.(2mks) 10.Name the deficiency disease that results from lack of proteins in a persons diet.(2mks)

Biology Form 4 Question Paper

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