4551-3c Bio Pat f4 2014_skema

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BAHAGIAN PENGURUSAN SEKOLAH BERASRAMA PENUH DAN SEKOLAH KECEMERLANGAN

PENTAKSIRAN DIAGNOSTIK AKADEMIK SBP 2014 PEPERIKSAAN AKHIR TAHUN (TINGKATAN 4) BIOLOGI Kertas 3 SET 3 1 jam 45 minit

PERATURAN PEMARKAHAN

Peraturan Pemarkahan ini mengandungi 5 halaman bercetak

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No

CRITERIA

MARKS

Able to complete Table 1 based on the experiment. Sample answers: Solution

A1

Reagent

Iodine solution

Test procedure 1. 2 ml of each food sample is poured into a test tube 2. Three drops of iodine solution are added to each food sample.

A2

1(a) A1

Biuret test

A2

A1

A2

DCPIP solution

1. 2 ml of each food sample is poured into a test tube 2. 1 ml of 20% sodium hydroxide solution is the added to each of the food samples and shaken well 3. A few drops of 1% copper(II) sulphate solution are then added slowly to each of the mixture 4. Each mixture is shaken well and allowed to stand 1. Put 5 drop of DCPIP solution into food samples ( 1m )

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Observation No colour change occur / the iodine solution does not change to blue black No colour change occur / the iodine solution does not change to blue black

1

Food sample turn purple / blue

1

1 Food sample does not change colour

No colour change occur (1m) DCPIP solution change colour from blue to colourless (1m)

1 1 1 ------6

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1(b)

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Able to make two accurate inferences based on two criteria: C1 –Solution A1 is a protein and Solution A2 is a Vitamin C C2 – Because Soluton A1 turn purple / blue when tested using Biuret test and Solution A2 change blue colour DCPIP into colourless

1 1

Sample answer: Solution A1 contain protein because it turn purple / blue when tested using Biuret test and solution A2 contain Vitamin C because it turn blue color of DCPIP into colourless

1(c)

----2

Able to state manipulated variable and responding variable Answers: Manipulated variable : Food sample A1 and A2 Responding variable : Nutrient content / class of food

1 1 ------2

(d)

Able to name another reagent to determine the class of food in food sampel A1 Sampel answer : Millon reagent

(e)

1

Able to state the class of food in food sample A1 Sampel answer: Carbohydrates / starch

(f)

1

Able to state which food sample suitable for Ali as a body builder and give reason to the answer P1 : Food sample A1 P2 : Because it contain protein P3 : that function to build new cell (for the muscle tissue.)

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1 1 1

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Sample answer : Food sample A1 should be taken by Ali in large amount because it contain protein.

3

Protein function to build new cells for muscle tissue

(g)(i)

Able to name another food sample that give the same result as food sample A1 to the same test. 1 1

P1: Manggo juice, Orange juice, any suitable answer P2 : It contain vitamin C

-------

Sample answer : Manggo juice / orange juice or any suitable answer because it contain vitamin C g(ii)

--------

2

Able to state the result of food test if a boiled food sample A2 is used and give reason . Sample answers: P1 : Boiled food sample A2 does not change the blue colour of DCPIP

1

solution 1 1 --------

P2 : The vitamin C in food sample A2 P3 : have been denatured / destroy [ Reject : dead ]

3

Sample answer : Boiled food sample A2 does not change the blue colour of DCPIP solution because it contain vitamin C that have been denatured / destroy Types of beans 2(a)

Number of first capture

Number of second capture Marked

Total number of beans

Soy beans

200

42

100

Green beans

80

20

30

1 mark

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1 mark

1 mark

3

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Able to calculate the population size of Malaysian Locust: (b)(i) Population size = a X b c = 80 X 30 20 = 120

b(ii)

1 mark 1 mark

2

Able to calculate the population size of Green Leek grasshopper Answer: Population size = a X b c = 200 X 100 42 = 476

(c)

1 mark 1 mark

2

Able to compare population size of Malaysian Locust and Green Leek grasshopper. 1

Sample answers: P1 : Population size of Green Leek grasshopper is more than Malaysian Locust P2 : Green Leek grasshopper more dominant than Malaysian Locust / Green Leek grasshopper eat more food than Malaysian Locust / Green Leek grasshopper have higher growth rate than Malaysian Locust

1 1 1 [ 1P1 + 2P2 ] -------3 10 marks

End of Mark Scheme Peraturan Pemarkahan Tamat

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