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NAME………………………………………………………….INDEX NO………………………
SCHOOL…………………………………………………….. DATE……………………………
SIGN…………………………….
231/3BIOLOGYPAPER 3PRACTICALJUNE/JULY 2016TIME: 1 ¾ HOURS
NAKURU SUB COUNTY SECONDARY SCHOOLS KC.S.E.TRIAL EXAMINATION - 2016
Kenya Certificate of Secondary Education
INSTRUCTIONS TO CANDIDATES
Write your name and index number in the spaces provided at the top of this page
Answer ALL questions You are required to spend the first 15minutes of the 1 ¾ hours allowed for this
paper reading the whole paper carefully before commencing your work. Answers must be written in the spaces provided in the question paper Additional pages must not be inserted.
FOR EXAMINERS USE ONLY
Question Maximum score
Candidate‘s score
1 142 133 13
Total score 40
Nakuru Sub County K.C.S.E. Trial Examination @ 2016 BIOLOGY PAPER 3 Page 1
1. You are provided with three unknown solutions F1 G1 and G2. G1 is the same as G2 except that G2has been boiledYou are also provided with iodine solution, Benedict’s’ solution, means of heating, 250 ml beaker labelled for warm water bath, thermometer, tripod stand, and means of timing, test tubes, test tube holder and a test tube rack.
(a)Place 2ml of solution F in a test tube and add an equal volume of Benedict’s solution. Shake to mix and then heat the test tube over a Bunsen burner flame.
(i) Write down your observations (1 mark)
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(ii) What can you deduce from the observation you made in (a)(i) above(1 mark)
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(b)Place about 2ml solution F in a test tube. Add 3 drops of iodine solution and shake to mix.
(i) Write down your observations (1 mark)
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(ii) What can you deduce from the observation you made in (b)(i) above (1 mark)
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(c) To about 4ml solution F in a test tube and 10 drops of solution G1 and mix. Allow the mixture to stand in a warm water bath at between 35oC - 38oC for 10 minutes. Divide the resulting mixture into two portions
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I To one portion in a test tube add 3 drops of iodine solution and shake to mix.(i) Write down your observations (1
mark)
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(ii)What can you deduce from the observation you made in (c) (i) above (1 mark)
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II To the second portion in a test tube add 2ml Benedict’s solution. Shake to mix and then heat the test tube over a Bunsen burner flame
(i) Write down you observation (1 mark)
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(ii) What can you deduce from the observation you made in (c) (II) (i) above?
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(d)To about 4ml solution F in a test tube add 10 drops of solution G2 and mix. Allow the mixture to stand in a warm water both at between 35oC and 38oC for 10 minutes. Divide the resulting mixture into two. Carry out iodine test and Benedict’s test as described in (c) above. Complete the table below.
(2 marks)
test observations conclusions
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Iodine test
Benedict’s test
(e)(i) suggest the identity of solution G1 (1 mark)…………………………………………………………………………………………………
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(ii) Give a reason for your answer (1 mark)
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(iii) Name one part on a mammal and one part in a plant where a substance with an activity similar to that of G1 can be found (2 marks)
Mammal ………………………………………………………………………………..
Plant ………………………………………………………………………………………
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The photographs below are of plants that are adapted to different habitats. Examine them
(a)(i) Which of the plants are adapted to arid conditions(2 marks)
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(ii)Give four observable features that enable the plant you have stated in (a)(i) above to survive in arid regions.
(4 marks)
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(iii) State three adaptive features not observable in the photographs of the plants you stated in (a)(i) above (3 marks)
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(iv) Give the term used for plants that are adapted to Arid and semi-arid conditions (1 mark)
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(b) List three adaptations of plants that grow partially submerged in fresh water. (3 marks)
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3. Photographs M and N below are skulls of two different animals. Examine them.
(a) With a reason, state the class of animals from which two skulls were obtained (2 marks)
Class……………………………………………………………………………………………………………………..
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Reason …………………………………………………………………………………………………………………….
(b)Giving reasons, state the diet of the animals whose skulls are shown in the diagram(4 marks)
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Reason ……………………………………………………………………………………………………………………..
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Reason ……………………………………………………………………………………………………………………..
(c) Name the structure labelled F in the photograph N and the structure that is found in the shaded part labelled T in a living animal in photograph M
(2 marks)
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T…………………………………………………………………………………………………………………………….
(d)Name and explain the role of the gap labelled J in photograph M( 2 marks)
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(e)Give the collective name for the structure labelled S in photograph N and state their functions.
(2 marks)
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(f) Besides the feature that can be observed in photograph M, state one way in which the animal is adapted to its diet.
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