Set 11 P3

SULIT 4551/3

Answer all questions

Question 1

A student carried out an experiment to study the content of vitamin C (ascorbic acid) in a cooked pineapple. The experiment was carried out using a pineapple that was cooked in a certain time limit, using a syringe.

Seorang pelajar menjalankan eksperimen untuk mengkaji kandungan vitamin C (asid askorbik) dalam sebiji nenas yang dimasak. Eksperimen dijalankan dengan menggunakan sebiji nenas yang dimasak dalam tempoh masa tertentu dengan menggunakan picagari seperti rajah di bawah.

The student found out that the volume of 20 ml of 0.1% ascorbic acid will caused 1 ml DCPIP to decolourised. The volume of uncooked pineapple juice which caused 1 ml DCPIP to decolourised was then recorded.

This experiment was repeated using a pineapple that was cooked for 0.5 minute, 1.0 minute, 2.0 minutes, 3.0 minutes and 5 minutes.

Diagram 1 shows the volume of each pineapple juice for every time the pineapple was cooked.

Beliau mendapati 20 ml isipadu asid askorbik 0.1% melunturkan 1 ml DCPIP . Isipadu jus nanas yang tidak dimasak untuk melunturkan 1 ml DCPIP dicatat.

Eksperimen diulang menggunakan buah nanas yang dimasak dalam tempoh 0.5 minit, 1.0 minit, 2.0 minit, 3.0 minit dan 5.0 minit.

Rajah 1 menunjukkan bacaan bagi setiap isipadu jus nanas bagi setiap tempoh buah nanas yang dimasak.

Uncooked

Cooked for 0.5 minutes

Cooked for 1.0 minutes

Cooked for 2.0 minutes

Cooked for 3.0 minutes

Cooked for 5.0 minutes

(a)(i)State two observations that can be derived from this experiment.

(a)(i)Nyatakan dua pemerhatian yang dapat dibuat daripada eksperimen ini

1.............

.

2...

..

[3marks]

(ii)State the inference which corresponds to the obsevations in (a) (i)

(ii)Nyatakan inferens bagi setiap pemerhatian di (a) (i)

1. .

.

2. .

..

[3marks]

(b) Based on Diagram 1, record the volume of pineaple juice which cause DCPIP to decolourised in Table 1 and complete the table

(b) Berdasarkan Rajah 1, catat isipadu jus nenas yang melunturkan DCPIP dalam

Jadual 1 dan lengkapkan jadual itu.

Time taken for pineapple juice to cook.

(minutes)Volume of pineapple juice to decolourised 1 ml of DCPIP solution (ml)Content of ascorbic acid

(%)

(Uncooked) 0.0

0.5

1.0

2.0

3.0

5.0

Table 1

Percentage of ascorbic acid can be calculated using this formula:

Volume of ascorbic acid 0.1%

Percentage of ascorbic acid in pineapple juice = X 0.1

Volume of pineapple juice

[3marks]

(c)Complete Table 2 based on this experiment.

(c) Lengkap Jadual 2 berdasarkan eksperimen ini.

Variable Method to handle the variable

Manipulated: ..................................................

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

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

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

Responding : .................................................

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

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

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

Controlled : .............................................

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

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

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

TABLE 2

[3marks]

(d) State the hypothesis for this experiment.

(d) Nyatakan hipotesis eksperimen itu.

.

.

..

[3marks]

(e)(i)Based on Table 2, plot a graph of ascobic acid volume against the time used in

cooking the pineapple juice.

(e)(i)Berdasarkan Jadual 2, lukiskan graf isipadu asid askorbik melawan tempoh

nenas dimasak pada kertas graf yang disediakan

[3marks]

(ii) Explain the relationship between the volume of ascobic acid and time used to cook the

pineapple juice based on the graph in (d)(i)

(ii) Terangkan perkaitan antara kandungan asid askorbik dengan masa buah nenas

dimasak dalam graf di (d)(i)

..

..

..

[3marks]

(f) The experiment is repeated using pineapple juice that is cooked for 5 minutes but the volume of

pineapple juice is increased.

(f) Eksperimen diulangi pada tempoh buah nenas dimasak selama 5 minit tetapi isipadu jus buah

nenas ditambah.

(i) Predict the contain of ascorbic acid when the volume of pineapple juice is increased.

(i) Ramalkan kandungan asid askorbik bila isipadu jus buah nanas ditambah.

.

..

..

[3marks]

(ii) If the pineapple is kept for a few days, explain the relationship between ascorbic acid content and

the time .

(ii) Jika buah nenas disimpan beberapa hari, nyatakan perkaitan antara kandungan asid askorbik

dengan masat.

..........

..

..

[3marks]

(g) Based on the results of experiment, state the operational defination of ascorbic acid

content.

(g) Berdasarkan keputusan eksperimen ini, nyatakan pengertian kandungan asid askorbik

secara operasi

..

..

..

[3marks]

(h)A same experiment has been carried out to study ascorbic acid content in fruit juices using these materials and apparatus:

Ascorbic acid solution, DCPIP solution, lime juice, guava juice, specimen tube, syringe and measuring cylinder

Categorised these materials and apparatus based on the function of exsperiment

Satu eksperimen yang sama telah dijalankan untuk mengkaji kandungan asid

askorbik dalam jus buah dengan menggunakan bahan berikut:

larutan asid askorbik , larutan DCPIP, jus limau kasturi, jus jambu batu, tiub spesimen, picagari dan selinder penyukat

Kategorikan bahan dan radas berdasarkan fungsi dalam eksperimen.

[3marks]

QUESTION 2

Based on your biological knowledge, plan a laboratory experiment to investigate the effect of cigarette smoke on our lungs by using the laboratory material and apparatus like thermometer, universal indicator and cotton wool after intake different number of cigarette.

(a)Objective

(b)Variables

(c)Hypothesis

(d)List of apparatus and materials

(e)Technique used

(f)Procedure

(g)Results

(h)Conclusion

[ 17 marks ]

SOALAN 2

Berdasarkan pengetahuan biologi anda, rancangkan satu eksperimen makmal untuk menyiasat kesan asap rokok ke atas peparu dengan menggunakan bahan dan radas makmal seperti termometer, penunjuk universal dan kapas selepas pengambilan bilangan rokok yang berbeza.

(a)Objektif kajian

(b)Pembolehubah

(c)Hipotesis

(d)Senarai radas dan bahan

(e)Teknik yang digunakan

(f)Prosedur eksperimen

(g)Keputusan

(h)Kesimpulan[ 17 markah ]

END OF QUESTION PAPER

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DIAGRAM 1

a (i)

a (ii)

b

c

d

e (i)

e (ii)

f (i)

f (ii)

g

h

Smoking is the act of inhaling smoke from burning tobacco. During smoking heat, tar and nicotine are released by cigarette smoke

Merokok ialah satu tindakan menyedut asap dari pembakaran tembakau. Semasa merokok haba, tar dan nikotin dibebaskan dari asap rokok.

RUANG UNTUK JAWAPAN / SPACE FOR ANSWER

No. soalan / Question No :

For examiners use

No. soalan / Question No :

For examiners use

No. soalan / Question No :

For examiners use

For examiners use

No. soalan / Question no : ..

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