SOLAF 2014BIOLOGIMODUL 2SOALAN 1 KERTAS 3An experiment was carried out to investigate the effect of different concentration of sucrose solution on potato discs. Satu eksperimen telah dijalankan untuk mengkaji kesan pelbagai kepekatan larutan sukrosa ke atas cakera kentang

The following steps were carried out.Langkah-langkah berikut telah dijalankan.

Step 1 : A cork borer was used to obtain 50 potato discs of uniformed size. Langkah 1: Penebuk gabus digunakan untuk mendapatkan 50 cakera kentang yang sama saiz.

Step 2 : The potato discs were divided into 5 groups, P,Q, R, S and T. Each group contains 10 potato discs which were placed in five different petri dishes.Langkah 2: Cakera kentang dibahagikan kepada lima kumpulan, P, Q, R, S dan T. Setiap kumpulan mengandungi 10 cakera kentang diletakkan dalam lima piring petri yang berbeza.

Step 3 : Distilled water and sucrose solution with different concentration was poured into each petri dish as shown in Table 1.Langkah 3: Air suling dan larutan sukrosa pelbagai kepekatan dimasukkan ke dalam piring petri seperti ditunjukkan dalam Jadual 1.

Group/ KumpulanSolution/ Larutan

PDistilled waterAir suling

Q0.2 mol dm-3 sucrose solution0.2 mol dm-3 larutan sukrosa

R0.4 mol dm-3 sucrose solution0.4 mol dm-3 larutan sukrosa

S0.6 mol dm-3 sucrose solution0.6 mol dm-3 larutan sukrosa

T0.8 mol dm-3 sucrose solution0.8 mol dm-3 larutan sukrosa

Table 1 / Jadual 1Step 4 : The length of each group of potato disc was measured before the immersion by arranging the discs on a callibrated cardboard as shown in Diagram 1.Langkah 4: Panjang setiap kumpulan cakera kentang diukur dengan menyusun cakera kentang di atas kadbod yang telah dikalibrasi sebelum direndam seperti ditunjukkan dalam Rajah 1

Diagram 1/ Rajah 1Step 5 : The potato discs were then immersed in each solution for 30 minutes. After 30 minutes, the discs were then arranged on the callibrated cardboard.Langkah 5: Cakeraentang direndam dalam setiap larutan berkenaaan selama 30 minit. Selepas 30 minit, cakera disusun di atas kadbod yang telah dikalibrasi .

Table 2 shows the results of this experiment.Jadual 2 menunjukkan keputusan eksperimen

Concentration of solution Kepekatan larutan(mol dm-3)Length of 10 discs after immersion for 30 minutes / cmPanjang 10 keping cakera kentang selepas 30 minit

0.0

cm

01211109836547312

0.2

cm

01211109836547312

0.4

cm

01211109836547312

0.6

cm

01211109836547312

0.8

cm

01211109836547312

Table 2/ Jadual 2(a)(i)State two different observations made from Table 2.Nyatakan dua pemerhatian yang befbeza berdasarkan Jadual 2

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

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

2.................

.................[3 marks]

(ii)State the inference which corresponds to the observations in 1(a)(i).Nyatakan dua inferens berbeza yang berkaitan dengan pemerhatian dalam (1)(a)(i)

Inference from observation 1/ Inferens dari pemerhatian 1 :

...

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

Inference from observation 2 / Inferens dari pemerhatian 2 :

..

......................[3 marks]

(b)Record the length of potato discs after 30 minutes immersion in the boxes provided in Table 2.Rekodkan panjang cakera kentang selepas 30 minit rendaman dalam kotak yang disediakan dalam Jadual 2[3 marks]

(c)Complete Table 3 based on this experiment.Berdasarkan eksperimen, lengkapkan Jadual 3.VariablePembolehubahMethod to handle the variableCara mengendalikan pembolehubah

Manipulated variablePembolehubah dimanipulasi

......

...

Responding variablePembolehubah bergerakbalas

.......

..

..

.

Constant variablePembolehubah dimalarkan

.........

....

Table 3/ Jadual 3[3 marks]

(d)State the hypothesis for this experiment.Nyatakan hipotesis untuk eksperimen ini

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

.[3 marks]

(e)(i)Construct a table and record all the data collected in this experiment. Your tableshould have the following titles :Bina jadual dan rekodkan semua data yang dikumpulkan dalam eksperimen ini. Jadual anda perlu mengandungi tajk-tajuk :

Concentration of sucrose solution/ Kepekatan larutan sukrosa Length of 10 discs before 30 minutes immersionPanjang10 kepng cakera sebelum rendaman 30 minit Length of 10 discs after 30 minutes immersionPanjang 10 keping cakera selepas rendaman 30 minit Change in lengthPerubahan panjang

[3 marks](ii)Use the graph paper provided on page 5 to answer this part of the question. Using the data in e(i), draw the graph of change in length against concentration of sucrose solution.Dengan menggunakan kertas graf yang disediakan, lukiskan graf perubahan panjang melawan kepekatan larutan sukrosa[3 marks]

Graph of change in length of potato discs against concentration of sucrose solution.

(f)Based on the graph in e(ii), explain the relationship between the concentration ofsucrose solution to the change in length of potato discs.Berdasarkan graf di (e)(ii), jelaskan hubungan antara kepekatan lerutan sukrosa dengan perubahan panjang cakera kentang ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................[3 marks](g) If the experiment is repeated using potato discs of the same diameter but different thickness. Predict the change in diameter of the potato discs. Explain your prediction. Eksperimen ini diulang menggunakan cakera kentang yang sama diameter tetapi berbeza ketebalan. Ramalkan perubahan diameter cakera kentang. Terangkan ramalan anda.

............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................[3 marks](h) Based on the result from this experiment, what can be deduced about osmosis ? Berdasarkan keputusan eksperimen ini, apa yang boleh anda simpulkan tentang osmosis?

............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................[3 marks](i) Another student wishes to investigate the movement of substances across the plasma membrane. He is provided with the following materials : Seorang murid lain ingin mengkaji pergerakan bahan merentas membran plasma. Beliau disediakan dengan bahan-bahan berikut : Visking tubing / Tiub Visking Egg shell / Cengekarng telur Cellophane tape / selopantep Muslin cloth / Kain kasa Plastic/ Plastik Classify the materials above according to its permeability. Kelaskan bahan-bahan berikut berdasarkan ketelapannya.

[3 marks]SOALAN 2 KERTAS 3 A semipermeable membrane is defined as a membrane that allows certain molecules to diffuse through it but does not allow the diffusion of other molecules. The diffusion of molecules through a semipermeable membrane depends on the size of the molecules.Membran separa telap didefinisikan sebagai membran yang membenarkan molekul tertentu meresap melaluinya tetapi tidak membenarkan peresapan molekul-molekul yang lain. Peresapan molekul melalui membran separa telap adalah berdasarkan saiz molekul-molekul tersebut.Based on the above information, plan a laboratory experiment to study the size of molecules that can diffuse through a semipermeable membrane.Berdasarkan maklumat di atas, rancang satu eksperimen dalam makmal untuk mengkaji saiz molekul yang boleh meresap melalui membran separa telap.The planning of your experiment must include the following aspects:Perancangan eksperimen anda hendaklah meliputi aspek-aspek berikut:Problem statementPernyataan masalahHypothesisHipotesisVariablesPembolehubahList of apparatus and materialsSenarai radas dan bahanExperimental procedure or methodKaedah atau prosedur eksperimenPresentation of dataCara data dipersembahkanConclusionKesimpulanJPN PERAK 8