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Bondo Biology paper 3 questions

NAME:……………………………………………………   INDEX NO……………………………….
SCHOOL:…………………………………………….…..   CANDIDATE’S SIGN …………………..

DATE ……………………………………..

231/3

BIOLOGY

Paper 3

THEORY

July/August- 2015
Time: 2 Hours

BONDO SUB-COUNTY SECONDARY SCHOOLS JOINT EVALUATION – 2015

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

231/3

BIOLOGY

Paper 3

THEORY

July/August- 2015
Time: 2 Hours


INSTRUCTIONS TO CANDIDATES

(a)        You are required to spend the first 15 minutes of the 1 ¾ hours for this paper reading the whole paper certainly before commencing your work.

(b)        Answers must be written in the spaces provided in the question paper.

(c)        Additional pages must not be inserted

For Examiner’s Use Only

Question Maximum Score Candidate’s Score
1 16  
2 12  
3 12  
TOTAL 40  

This paper consists of 12 printed pages.

Candidates should check the question paper to ensure that all pages are printed as indicated and no questions are missing.

1.         Using the cork borer provided bore out three long pieces of potato tissues. Measure out and cut three 3 cm cylindrical pieces.

            Take the pieces of potato tissue and place each into a separate test-tube labeled D, e and F respectively.

            Fill test tube D with solution labeled L1

            Fill test-tube E with solution labeled L2

            Leave test-tube F blank, I.e add no liquid to it

            Allow the experiment to stand for 30 minutes

            (i)         After 30 minutes, remove one piece of tissue at a time; dry it with blotting paper and

measure its length. Record your measurements in the table below.                           (3mks)

Solution into which tissue was placed Measurement before putting in solution Measurement after adding solution
L1 3cm  
L2 3cm  
Zero (0) 3cm  

(ii)        Account for the observation made in the measurements of each tissue after 30 minutes in test tubes labeled D and E above.                                                                                   (3mks)

D……………………………………………………………………………………………………

……………………………………………………………………………………………………….

……………………………………………………………………………………………………….

……………………………………………………………………………………………………….

……………………………………………………………………………………………………….

……………………………………………………………………………………………………….

E……………………………………………………………………………………………………

……………………………………………………………………………………………………….

……………………………………………………………………………………………………….

……………………………………………………………………………………………………….

……………………………………………………………………………………………………….

……………………………………………………………………………………………………….

(iii)       What was the purpose of test – tube F and its content.                                             (1mk)

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

……………………………………………………………………………………………………….

(iv)       Crush the rest of the potato into paste using a pestle and mortar and add little water to make a suspension and stir. Carry out food tests on the suspension using the reagents provided. Fill your answers in the table below.                                                     (6mks)

Food Substance Procedure Observation Conclusion
                                     

2.         The diagrams below represent body parts of some organisms (animals). Study them and answer the question that follow.

            (a)        (i)         Suggest the type of food eaten by organisms with the parts labeled A, B, C and F

                                                            Food                                                   Reason                        (4mks)

                                    A

                                    B

                                    C

                                    F

                        (ii)        With reasons, suggest the likely habitat of the organism from which the parts

labeled D and E were obtained.

Part                                         Habitat                                               Reason

D

E

                                                                                                                        (4mks)

            (b)        (i)         Suggest the type of evolution that is exemplified by the organisms labeled D, E and

F. Give reason for your answer.

The type of evolution                                                                                      (2mks)

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

……………………………………………………………………………………………………….

Reason

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

……………………………………………………………………………………………………….

                        (ii)        Suggest the significance of the above named type of evolution for the organism                                                                                                                                                                 (2mks)

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

……………………………………………………………………………………………………….

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

……………………………………………………………………………………………………….

3.

Above are photographs labeled P, Q, R, S, T and U of fruits obtained from different plants. Examine them and answer the questions underneath.

            (a)        With reasons, Determine the modes of dispersal for the fruits labeled Q, R ans S    (6mks)

                        Q……………………………………………………………………………………………..

                        Reason……………………………………………………………………………………….

                        ……………………………………………………………………………………………….

                        ……………………………………………………………………………………………….                       ……………………………………………………………………………………………….

                        ……………………………………………………………………………………………….

R……………………………………………………………………………………………..

                        Reason……………………………………………………………………………………….

                        ……………………………………………………………………………………………….

                        ……………………………………………………………………………………………….                       ……………………………………………………………………………………………….

                        ……………………………………………………………………………………………….

S……………………………………………………………………………………………..

                        Reason……………………………………………………………………………………….

                        ……………………………………………………………………………………………….

                        ……………………………………………………………………………………………….                       ……………………………………………………………………………………………….

                        ……………………………………………………………………………………………….

            (b)        State the form of placentation in Q, S, T and U.                                                        (4mks)

Q……………………………………………………………………………………………..S…………………………………………………………………………………………….. T…………………………………………………………………………………………….. U…………………………………………………………………………………………….

            (c)        With a reason, identify the type of fruit represented by specimen U                         (2mks)

                        Type.…………………………………………………………………………………………                        Reason……………………………………………………………………………………….

                        ……………………………………………………………………………………………….

                        ……………………………………………………………………………………………….                       ……………………………………………………………………………………………….

                        ……………………………………………………………………………………………….

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