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NAME ___________________________________ INDEX No. ___________________

SIGNATURE: _____________________________

553/2

BIOLOGYPRACTICAL

PAPER 2July/Aug. 2010

2 hours

Uganda Certificate of Education

JOINT MOCK EXAMINATIONS 2010

BIOLOGY PRACTICAL

Paper 2

2 hours

INSTRUCTIONS TO CANDIDATES:

Attemptall the questions in this paper.

Drawings should be made in the spaces provided.Use sharp pencils for drawings.

Coloured pencils should not be used.

No additional sheets of writing paper are to be inserted in the booklet.

Work on additional sheets will not be marked.

Question

Marks

1

2

3

TOTAL

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Turn over2010 jmeb

1. You are provided with solution A. Use it to carry out the followinginvestigations

(a) Test solution A as indicated in the table below and record yourobservations.

TEST OBSERVATIONS DEDUCTIONS

(i) To 2cm2 of A in atest

tube add 3 dropsof

iodine solution

(ii) To 1cm3 of A in atest tube add 1cm3

ofBenedicts solutionandboil.

(iii) To 1cm3 of A in atest tube add lcm3 ofsodium hydroxide

solution and shakewell. Add copper IIsulphate solutiondrop wise and shake

(b) Rinse your mouth with clean water then collect 2cm3 of saliva by

spitting in aclean test tube. Add 2cm3 of saliva to 2cm3 of solution A in the test

tube.Leave the mixture to stand in a water bath at 35 40oC for 10

minutes.

(i) Add 1cm3 of Benedicts solution to 1cm3 of the mixture aboveand boil.

Make your observation and conclusion.

Observation:

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Conclusion:

(ii) To 1cm3 of the mixture in a test tube add 1cm3 of sodiumhydroxide

and shake well. Add 2 drops of copper II sulphate solutionand shake

then make your observation and conclusion.

Observation:

Conclusion:

(iii) To 1cm3 of the mixture in a test tube add 1cm3 of iodinesolution and

shake.Make your observation and conclusion.

Observation:

Conclusion:

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(iv) Why was the mixture kept at 35 40oC and left to sand for10

minutes?

(v) Explain the result obtained in experiment (b) (i)

vi) What was the role of saliva to this experiment?

(vii) What physiological process is the experiment demonstrating?

2. You are provided with specimen F and G which were obtained from abird.

(a) (i) State the name of each specimen

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F........................................................................................................................

..

G.........................................................................................................................

(ii) From which part of the body was each specimen obtained?

F........................................................................................................................

..

G.........................................................................................................................

(b) State the name of the bones with which each specimen articulatesat each of

the ends

(i)

F........................................................................................................................

..

...........................................................................................................................

(ii)

G.......................................................................................................................

............................................................................................................................

(c) (i) Using observation features, suggest the type of joint formed ateach end

of each specimen.

F.................................................................................................................

.................................................................................................................

..............................

G

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.................................................................................................................

.................................................................................................................

..............................

(d) (i) State three functions of the specimen.

.................................................................................................................

.................................................................................................................

.................................................................................................................

................................................

(ii) How are the structures suited for the function mentioned in (d)

(i) above?

.................................................................................................................

.................................................................................................................

.................................................................................................................

.................................................................................................................

.................................................................................................................

.................................................................................................................

.................................................................................................................

.................................................................................................................

.................................................................................................................

...............

(e) Give three observable differences between F and G.

G F

(i)

(ii)

(iii)

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Draw and label F. State your magnification.

3. You are provided with specimens L, M, N, O.

(a) (i) Suggest a classification/ identification for all of them

........................................................................................................

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

...............................................................................................................................

(iii) Identify each of them:

L........................................................................................................................

.......

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M.......................................................................................................................

.......

N........................................................................................................................

......

O..............................................................................................................................

(b) Fill in the information in the table about the specimens, describingmade of

Dispersal.

Specimen

Mode of dispersal Significant featuresevidence

L

M

N

O

(c) Open L gently and cut a transverse section of M. Obtain 2 seeds ofM. Study

them carefully by feeling them between your fingers and pressing

them.

(i) State your observations

.................................................................................................................

.................................................................................................................

................................

(ii) What is the significant of your observation?

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.................................................................................................................

.................................................................................................................

................................

(iii) Draw and label one half of L.

(iv) Construct a dichotomous key for the specimens using- Number of seeds- Arrangement of seeds- Any other significant external features.

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END.

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