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NAME ___________________________________ INDEX No. ___________________SIGNATURE: _____________________________

553/3BIOLOGYPRACTICALPAPER 3

July/Aug. 20102 hours

Uganda Certificate of Education

JOINT MOCK EXAMINATIONS 2010

BIOLOGY PRACTICAL

Paper 3

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. (a) You are provided with specimen P.

(i) What part of a plant is specimen P?

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(ii) Give reason for your answer.

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(iii) Cut a transverse section of specimen P and draw a labeleddiagram of one half of it.

(iv) Explain how specimen P is dispersed

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(b) Obtain the cut halves of specimen P and squeeze out some of itsjuice

into a beaker. Carry out the following test on it.

(i) Test for starch. Record your results on the table below.(ii) Test for reducing sugar. Record your results on the table

below.(iii) and (iv) Measure 2cm3 of DCPIP in two different test tubesand

carry out the tests (iii) and (iv) in the table below.

Procedure Observation Conclusion(i)

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(ii)

Procedure Observations(iii) To 2cm3 of DCPIP in a

test tube, add solution of Pin drops. Count the numberof drops needed todecolourize the DCPIP

(iv) To 2cm3 of DCPIP in atest tube add boiled solutionof P in drops. count thenumber of drops needed todecolourize the DCPIP.

(c) (i) What is the food substance being tested for in (b) (iii) above.

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(ii) What effect does boiling have on the solution?

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................................(iii) What implication does this have on the preparation of foods

containingthe substance named in (c) (i) above?

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(iv) Name the disease due to lack of the substance named in c(i)

above.

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(v) What are the symptoms of this disease?

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2. You are provided with specimen Q. Study it and answer the following:

(a) (i) classify the specimen as follows

Kingdom .................................................................................................

Phylum....................................................................................................

Class.......................................................................................................

(ii) Give its habitat.

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(b) Study the skin of specimen Q and

(i) State one significant feature /structure found on the skin

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(ii) What is the function of the structures in (b)(i) above

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(iii) Obtain a scalpel or knife & move it over the skin from the tailto the

head direction. State your observation.

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Move it over again this time from near the head towards the tail.

State your observation.

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(iv) What is the significance of your observations?

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(c) (i) What is the significant feature located on the dorsal surface ofspecimen Q?

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(ii) Describe its structure briefly

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(iii) From its position and structure what is its function?

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(iv) State any two adaptations to its function

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(d) With the left side of the specimen Q facing you, make a labeleddrawing ofthe region. State your magnification.

3. You are provided with specimen T1, T2, T3, T4, T5

(a) State the type of fruits for each specimen.

T1................................................................................................

T2................................................................................................

T3................................................................................................

T4................................................................................................

T5................................................................................................

(b) Describe how the dispersal of specimen T1 , T2 and T3 occurT1................................................................................................

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T2................................................................................................

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T3................................................................................................

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(c) Cut cross section of specimen T1, P4 & longitude section of T5 andremoveone side of the ovary from specimen T2.

Describe the seed arrangement of specimens in each case.

T1................................................................................................

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T2................................................................................................

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T4................................................................................................

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(d) Examine the cross section of specimen T2 and T4. From yourobservationsstate three differences between specimens T2 and P4.

T1 T4(i)

(ii)

(iii)

(e) Construct a dichotomous key from the specimens T1, T2, T3, T4, T5.

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