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Biology Paper Question Paper

Biology Paper

Course:Secondary Level

Exam Year:2009

Instructions:Answer all the questions. 1.State two adaptations of alveoli to gaseous exchange.(2mks) 2.Explain why it is advisable to breathe through the nose rather than the mouth in man.(2mks) 3.State the role of each of the following in the nasal cavity of a mammal: (i)Goblet cells (ii)Cilia.(2mks) 4.Explain what happens when the diaphram is pulled in the downwards direction.(2mks) 5.In an experiment to analyze a sample of air,a J tube was placed to find out the amount of carbon(iv)oxide and oxygen present.The length of the air sample in the J tube was 10 cm and after mixing it with soditm hydroxide solution for some minutes the lengh reduced to 9.996 cm.When pyrogallic was added to the air sample,the length reduced to 7.9 cm. a)What was the percentage of each of the following gases in the sample of air? i)Oxygen. ii)Carbon(iv) oxide.(4mks) b)Explain the role of sodium hydroxide and pyrogallic acid in this experiment.(2mks) 6.State and explain ways the leaves are adapted for gaseous exchange.(2mks) 7.Name three sites where gaseous exchange takes place in terrestial plants.(3mks) 8.Name three respiratosy diseases.(3mks) 9.Differentiate between anaerobic and aerobic respiration.(4mks) 10.Name the products of anaerobic respiration in plants and in animals.(2mks)

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