Spm Percubaan 2008 Mrsm Biology Paper 3

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Answer all questions. 1. A group of students carried out an experiment to study the water pollution level in four locations M, N, O and P. Sekumpulan pelajar telah menjalankan satu eksperimen untuk mengkaji tahap pencemaran air pada empat tempat yang berbeza iaitu M, N, O dan P Diagram 1.1 shows the procedure used by the students. The time taken for the methylene blue solution to decolourise is shown in Table 1.1 Rajah 1.1 menunjukkan kaedah yang telah digunakan oleh pelajar. Masa untuk pelunturan warna metilena biru ditunjukkan di dalam Jadual 1.1

Syringe Penitis Reagent bottle Botol reagen 1 ml of 0.1% methylene blue 1 ml metilena biru 0.1%

Water sample Sampel air

Stopper Penutup

Water sample + 1ml of 0.1 % methylene blue Sampel air + 1 ml metilena biru 0.1%

Diagram 1.1 Rajah 1.1

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SULIT Table 1 shows the results of the experiment. Jadual 1 menunjukkan keputusan eksperimen Water sample Sampel air

Time taken for methylene blue solution to decolourise (minutes) Masa untuk pelunturan warna metilena biru (minit)

M

N

O

P

Table 1.1 / Jadual 1.1

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SULIT (a)

(b)

Record the time taken for the methylene blue solution to decolourise in the boxes provided in Table 1.1 Rekodkan masa pelunturan warna metilena biru dalam kotak yang disediakan dalam Jadual 1.1 [3 marks] [3 markah] (i)

Based on Table 1.1 state any two observations that can be seen from the experiment. Berdasarkan Jadual 1.1 nyatakan mana-mana dua pemerhatian yang boleh dibuat daripada eksperimen ini Observation 1 / Pemerhatian 1: ….....……………………………………………….……………………….….. ………………………………………………………….……………………… Observation 2 / Pemerhatian 2: …………………..…………………………………..………………………… ……………………..…………..……………………………………………… [3 marks] [3 markah]

(ii)

State the inference for each observation made in (b) (i). Nyatakan inferens daripada setiap pemerhatian di (b) (i).

Inference from observation 1 / Inferens daripada pemerhatian 1: …………………...……………….….…………………..……………..…… ………………………..………………………………………………………

Inference from observation 2 / Inferens daripada pemerhatian 2: …………………………………. …….………………..……...…………….. …..…………………………………………………………………………… [3 marks] [3 markah]

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(c) Complete Table 1.2 to show the variables involved in the experiment and how the variables are operated. Lengkapkan Jadual 1.2 untuk menunjukkan pemboleh ubah yang terlibat dan bagaimana pemboleh ubah tersebut dikendalikan. Variables Pemboleh ubah

Method to handle the variable Cara mengendali pembolehubah

Manipulated variable: Pemboleh ubah dimanipulasi: ………………………………....

…………………………………..……..………

…………………………………

……….……………………………..…………

…………………………………

…………………………………………………

Responding variable: Pemboleh ubah bergerak balas: ………………………………....

…………………………………….....…………

…………………………………

………………………………..………………

…………………………………

…………………………………………………

Controlled variable: Pemboleh ubah dimalarkan: ………………………………....

……………………………………….…………

…………………………………

………………………………..………………

…………………………………

………………………………………………… Table 1.2 Jadual 1.2 [3 marks] [3 markah]

(d) State the hypothesis for this experiment. Nyatakan hipotesis bagi eksperimen ini. ……………………………………………………………………………………… ……………………………………………………………………………………… ……………………………………………………………………………………… [3 marks] [3 markah]

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(e) (i) Based on Table 2 construct a table and record the results of the experiment. Berdasarkan Jadual 2, bina satu jadual dan rekodkan keputusan eksperimen.

[3 marks] [3 markah] (ii) Based on the table in (e) (i), state the relationship between the time taken for the methylene blue solution to decolourise and the amount of dissolved oxygen in the water samples. Berdasarkan jadual di (e) (i), nyatakan hubungan antara masa pelunturan warna metilena biru dan kandungan oksigen terlarut dalam sampel air. …………………..…………..……………………………………………….……... ……………………………………………………………………………………… ……………………………………………………………………………………… [3 marks] [3 markah] (f)

A student shakes another reagent bottle containing sample O and methylene blue and leaves it on the table without covering. Seorang pelajar telah menggoncang botol reagen yang mengandungi sampel O dan metilena biru dan meninggalkan botol tersebut di atas meja tanpa berpenutup. Predict the observation that may be obtained and explain your answer. Ramalkan pemerhatian yang mungkin diperoleh dan terangkan jawapan anda. …………………..………….……..…………………………………………………... ………………………………………………………………………………………… ………………………………………………………………………………………… [3 marks] [3 markah]

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SULIT (g)

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Based on the experiment, define what Biochemical Oxygen Demand (BOD) is. Berdasarkan eksperimen ini, berikan maksud Keperluan Oksigen Biokimia (BOD). ……………………………………………..…………………………………………… …………………………………………..……………………………………………… …………………………………………..……………………………………………… [3 marks] [3 markah]

(h)

Explain the relationship between the level of pollution in the water samples and the time taken for methylene blue to decolourise. Terangkan hubungan antara tahap pencemaran di dalam sampel air dan masa untuk pelunturan warna metilena biru. ………..……………...……….……………………………………………...............…. .......…….…….…………………………………..……………………………............... .…... ………………………………………………………………………………......... [3 marks] [3 markah]

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SULIT (i)

The experiment is repeated by using three samples of water taken from different points as shown in Diagram 1.2. The results are shown in Table 1.3 and Table 1.4 shows the classification for water pollution. Eksperimen ini diulang dengan menggunakan tiga sampel air dari tempat berbeza seperti dalam Rajah 1.2. Keputusan ditunjukkan dalam Jadual 1.3 dan Jadual 1.4 adalah klasifikasi bagi tahap pencemaran air. Chemical factory Kilang kimia

Station C Stesen C

Station B Stesen B

Station A Stesen A Diagram 1.2 / Rajah 1.2 Time to decolourise Masa pelunturan warna 4 hours / 4 jam

Level of pollution Tahap pencemaran Polluted / Tercemar

2 hours / 2 jam

Clean / Bersih

1 hour / 1 jam

Very polluted / Sangat tercemar

Table 1.3 / Jadual 1. 3

Table 1.4 / Jadual 1.4

Based on Tables 1.3 and 1.4, write down in Table 1.5 the time taken to decolourise methylene blue according to the pollution levels of the water samples. Berdasarkan Jadual 1.3 dan 1.4, tuliskan dalam Jadual 1.5 masa pelunturan metilena biru mengikut tahap pencemaran sampel air tersebut.

Sample Sampel

Time taken for methylene blue solution to decolourise Masa pelunturan warna metilena biru

Level of pollution Tahap pencemaran

Station A / Stesen A Station B / Stesen B Station C / Stesen C Table 1.5 / Jadual 1.5 [3 marks] [3 markah]

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2. The figure shows some apparatus that can be found in a laboratory. Rajah menunjukkan beberapa radas yang boleh di dapati dalam makmal.

By using the above apparatus, plan a laboratory experiment to investigate the relationship between the movement of air and the rate of transpiration. Dengan menggunakan alatan di atas, rancang suatu eksperimen makmal untuk menyiasat hubungan antara pergerakan udara dengan kadar transpirasi. The planning of your experiment must include the following aspects: Perancangan eksperimen anda harus merangkumi: Problem statement Pernyataan masalah Aim of investigation Objektif kajian Hypothesis Hipotesis Variables Pembolehubah List of apparatus and materials Senarai radas dan bahan Technique used Teknik yang digunakan Experimental procedure or method Kaedah atau prosedur eksperimen Presentation of data Persembahan data Conclusion Kesimpulan [17 marks] [17 markah] END OF QUESTION PAPER KERTAS SOALAN TAMAT 4551/3 © 2008 Hak Cipta Bahagian Pendidikan dan Latihan (Menengah) MARA

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