(b) (i) Draw a plan diagram of the longitudinally cut surface of specimen R (ii) Work out your magnification (iii) State the placentation of specimen R (c) (i) State the method of dispersal of specimen R and S giving reasons for each case. Fill your answers in the table below (ii) Give one advantage of the method of dispersal of specimen S and one disadvantage of dispersal of specimen R. 3. You are provided with photographs of specimen K, L, M, N and P. using observable features only, answer the questions that follow: (a) (i) State the phylum of the organisms (ii) Give two reasons for your answer in (a) (i) above (b) With reasons give the class of : (i) Specimen K Reason (ii) Specimen N . Reason (c) (i) State two ways by which specimen M is adapted to locomotion (ii) Identify the type of growth that occurs in members of specimen M (iii) Name the hormone responsible for metamorphosis in specimen M (d) State two economic importance of specimen P
CONFIDENTIAL INFORMATION TO SCHOOLS AND PRACTICALS SOTIK DISTRICT 1. Each candidate should have one fruit of; o Black jack labeled P o Tomato (ripe one – money maker variety) labeled Q Bean/pea (mature one) labelled R o Sonchus /fleabane/dandelion labeled S 2. Each candidate should have access to :- o DCPIP solution o Ethanol o Benedict’s solution o Iodine solution o Hot water bath o Clean water N/B Use clean droppers where applicable to minimize contamination of reagents. 3. Each candidate should be provided with; (i) 4 test-tubes in a test tube rack. (ii) Razor blade (or they can be asked to bring theirs). 1. You are provided with specimens labeled P, Q, R and S (a) State the type of fruits represented by each of the specimens (b) Explain how specimens R and S are adapted to their agents of dispersal (c) Cut the specimen Q transversely in the middle. Draw a well labeled diagram of the face of the cut surface of one of the halves (d) State the placentation of specimen Q 2. (a) Wash of the halves of specimen Q and place it in a mortar and grind it using the pestle to obtain its juice. Then add clean water enough to fill a test tube and shake. Then decant the juice into a clean test tube. Using the apparatus and the chemicals provided subject (b) Explain how digestions of the components of the food sample are digested in the ileum of a mammal (c) What is the importance of specimen Q in the human diet?
3. The photographs W and Z below are of plants obtained from different habitats (a) Suggest the possible habitat of specimen W (b) (i) Name the structure labeled Y in specimen W (ii) State the function of the structure named in (b) (i) above SECTION III- MARKING SCHEME KAKAMEGA CENTRAL DISTRICT 1. (a) b) Solution W; Reason – it is a reducing sugar that is absorbed directly and used in respiration to produce energy 2. a) Structure Name Function Food substance Solution Procedure Observation Conclusion Reducing sugar V To 1 ml of food substance add 1 ml of benedicts solution. Place in a warm/ hot water bath/ heat boil; Blue colour retained; Reducing sugar absent; W Blue- green – yellow- orange; Acc – brown - final colour Reducing sugar present
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