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Bomet ppr3 bio questions

Name…………………………………….…………………..…….Index No:………………………………………….

School …………………………………………………………….Candidate’s Signature …………..………………

      Date: …….………………………………………..

231/3                                                                                       

BIOLOGY                                                                                         

PAPER 3(PRACTICAL)

JULY/AUGUST – 2015

TIME: 2 HOUR

Kenya Certificate of Secondary Education (K.C.S.E.)

231/3                                                                                       

BIOLOGY                                                                                         

PAPER 3(PRACTICAL)

JULY/AUGUST – 2015

TIME: 2 HOUR

INSTRUCTIONS TO CANDIDATES

  • Write your name, Admissionnumber and name of your school in the spaces provided above
  • Sign and write the date of examination in the spaces provided.
  • This paper consists of three questions
  • Answer all the questions in the spaces provided.
  • This paper consists of 4 printed pages.
  • Candidates should check to ascertain that all pages are printed as indicated and that no questions are missing.

For Examiners Use Only

Question Maximum score Candidate’s score
1 12
2 14
3 14
Total Score 40

1.Study the photographs U, V, W and X showing fruit specimens that areopen to expose  the interna partsl.

  1. Name the parts labeled A, B, C and D   (4marks)

A………………………………………………………………………….……………………………….

B…………………………………………………………………………….…………………………….

C………………………………………………………………………………………….……………….
D……………………………………………………………………………..……………………………

  • Identify the type of fruit in photograph:  (2marks)
  • U……….………………………………………………………………………………………….
  • W………..…………………………………………………………………………………………
  • What type of placentation is found in the following fruits:                                                   (3mks)

U……………………………………………..……………………………………………………..……..

V…………………………………………………………………………………………………………..

W…………………………………………………………………………………………………….…….

  • How is the specimen in photograph W adapted to its functions?  (2marks)

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  • Which part of a flower develops into the region labeled  R in the photograph X   (1mark)

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2. Below is a diagram showing a type of metamorphosis exhibited by a butterfly

  1. Give the name of the type of metamorphosis in the diagram above.         (1mark)

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  • Write down two importance of metamorphosis.                (2marks)

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 …………………………………………………………………………………………………………………………………………………

  • Name stages Q and R                                                                                                                         (2mks)

Q……………………………………………………………………………………………………………

R……………………………………………………………………………………………………………

  • Differentiate the biological activities in the development stagesR and S. (4marks)

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  • Name the two major hormones that are associated with metamorphosis in insects.                     (2marks)

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  • (i) Name the class to which the organisms in the diagram above belongs.  (1mark)

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(ii)Give a reason for your answer in f (i) above.       (2marks)

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3. Label three test tubes P, Q and R. Into each test-tube, place 3ml of solution C.

          a) Put a drop of solution C on a white tile and add a drop of iodine solution.

              Record your observation.            (1mark)

…………………………………………………………………………………………………………………………………………………

b) Add 3 drops of 0.1%sodium chloride solution and 2ml of solution A to test tube Q.

To test-tube R, add three drops of 1.4% sodium chloride solution and 2mlof solution A. Sodium chloride is a source of sodium ions. Place the test tube P, Q and R in a water bath maintained at 370 C for 30minutes. Using a drop of the solution from each test-tube, repeat the procedure in (a) above and spare the rest for the next question. Record your observation in the table below. (3marks)

Test-tube Observation at the end of experiment
P  
Q  
R  

c) (i) Put 2cm3 of solution from test-tube P in a clean test tube and add 2cm3of Benedict solution, shake then heat the mixture to boil. Record your final observations in the table below. Repeat the procedure for solution Q and R.  (3marks)

Test-tube Observation at the end of experiment
P  
Q  
R  

 (ii) Account for your results in test-tubes Q and R.  (4marks)

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d)Why was the test-tube P included in the experiment? (1mark)

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e)Suggest the identity of solution    (1mark)

                        …………………………………………………………………………………………………………………………………………………

 f)Why was the water bath maintained at 370C      (1mark)

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