BAHAGIAN SEKOLAH BERASRAMA PENUH DAN SEKOLAH KECEMERLANGAN KEMENTERIAN PELAJARAN MALAYSIA

Transcription

1 BAHAGIAN SEKOLAH BERASRAMA PENUH DAN SEKOLAH KECEMERLANGAN KEMENTERIAN PELAJARAN MALAYSIA PERFECT 2011 SCORE BIOLOGY Student s Module PAPER QUESTION 1 1

2 Question 1 : No. Questions Marks Student notes 1 A group of students carried out an experiment to study the effect of the concentration of nutrients on the activity of yeast. Diagram 1.1 shows the method used by the students. The initial height of the coloured liquid in the manometer is shown in Diagram 1.2. The experiment was repeated using different concentrations of glucose. Table 1.1 shows the results of the experiment after 10 minutes. clip rubber tubing Rubber stopper Glass tube Manometer with coloured liquid Initial height of coloured liquid Boiling tube containing yeast suspension Diagram 1.1 Initial height of coloured liquid : cm DIAGRAM 1.2 2

3 Percentage concentration of glucose / % Final height of coloured liquid in the manometer after 10 minutes /cm

4 No. Questions Marks Student notes (a) Complete Table 1.2 by recording the height of coloured liquid in the manometer after 10 minutes (b) (i) Based on Table 1.1, state two observations. Observation 1 : Observation 2 : (ii) State the inference which corresponds to the observation in 1(b(i). Inference 1 : Inference 2 : 4

5 (c) Complete Table 1.2 for the three variables based on the experiment. Variable Manipulated variable: Method to handle the variable Responding variable: Controlled variable : (d) State the hypothesis for the experiment..... (e) (i) Based on Table 1.1, construct a table and record the results of the experiment which includes the following aspects: Percentage concentration of glucose Height of coloured liquid The rate of the activity of yeast 5

6 (e) (ii) Draw a graph of the rate of the activity of yeast against the concentration of glucose (iii) Based on the graph in 1(e)(ii), state the relationship between the rate of the activity of yeast and the concentration of glucose. Explain your answer (f) Based on the experiment, define anaerobic respiration in yeast operationally

7 (g) The experiment is repeated by using 1 ml of 0.1 mol dm - of sodium hydroxide solution is added into the boiling tube. Predict the manometer reading after 10 minutes. Explain your prediction (h) The following list is part of the apparatus and material used in this experiment. Yeast, metre rule, coloured liquid, electronic balance, glucose solution, measuring cylinder Complete Table 1. by matching each variable with the apparatus and material used in the experiment. Variables Apparatus Material Manipulated Responding Controlled Table 1. 7

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9 Question 2 : No. Questions Marks Student notes 2 Lemna minor is a species of free-floating aquatic plants from the duckweed family Lemnaceae. The plants grow mainly by vegetative reproduction: two daughter plants bud off from the adult plant. An experiment is carried out to investigate the effect of abiotic factor such as ph on Lemna sp. growth. Experiment is done under controlled conditions: 12 hours a day light exposure and using the same Knop s solution. Petri dish is filled with 20 ml Knop s solution with different ph value and 5 Lemna sp. each. The Knop s solution is treated by adding acid or alkali to achieve the ph value needed. ** Knop s solution is a solution which contains essential nutrient for plants growth. Knop s solution Petri dish Lemna minor Figure 1 After 7 days, the observation is made and the result shown in Table 1.1. ph value Petri dish Number of Lemna sp. 2 9

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11 11 Table 1.1 No. Questions Marks Student notes (a) State the number of Lemna sp. in the spaces provided in Table 1.1 (b) (i) Based on Table 1, state two different observations. Observation 1 : Observation 2 : (ii) State the inferences which corresponds to the observations in 1(b)(i). Inference 1 : 11

12 Inference 2 : (c) Complete Table 1.4 to show the variables involved in the experiment and how the variables are operated. Variable Manipulated variable: Method to handle the variable Responding variable: Controlled variable : 12

13 (d) State the hypothesis for this experiment..... (e) (i) Construct a table and record the results of the experiment. Your table should contain the following title. ph of water Number of Lemna sp. (e) (ii) Plot a graph showing the number of Lemna sp against the ph in the graph below (iii) Referring to the graph in (e) (ii), describe the relationship between the Lemna sp growth and the condition of the medium

14 (f) Based on the experiment, define operationally the abiotic factor in an ecosystem..... (g) The effluent from laundry shop flows into a pond nearby, predict the population of Lemna sp in the pond. Explain your answer..... (h) Classify the biotic and abiotic factors from the list provided below. Humidity, light intensity, decomposer, parasites, symbiotic organism, soil texture, invertebrates, topography 14

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16 Question : No. Questions Marks Student notes 1. A group of students conducted an experiment to study the effect of light intensity on the population distribution of Lichen on the tree trunk. He placed a 10 cm x 10 cm transparent quadrat on the East-facing surface of the tree trunk. He counted the number of squares that contained half or more than half of the areas covered by the Lichen. Square with less than half of the covered areas were not included. The procedures were repeated for the surfaces that face the direction of North (N), south (S) and west (W). Figure 1 shows how a quadrat is placed on the tree trunk. Each small square represent 1 cm 2. Figure 1 Table 1 shows the areas covered by the Lichen on the different surface of the tree trunk. Direction/position of Total surface area covered by surface Lichen East 60 cm 2 16

17 South 10 cm 5 cm 2 North 10 cm 45 cm 2 West 10 cm 52 cm 2 Table 1 17

18 a) Count the total surface area of Lichen for each quadrat and record the answer in the spaces provided in Table 1. b) (i) State two different observation based on the diagram in Table 1. Observation 1 : Observation 2 : (ii) State the inferences from the observation in 1 (b) (i). Inference 1 : Inference 2 : 18

19 (c) Complete Table 2 based on this experiment. Variable Method to handle the variable Manipulated variable: Responding variable: Controlled variable : Table 2 d) State the hypothesis for this experiment: e) (i) Construct a table and record all data collected in this experiment. Your table should have the following aspect: Title with correct unit Position of direction Total surface area covered by Lichen 19

20 (f) (g) (h) (ii) Use the graph paper provided to answer this question. Using the data in 1 (e) (i), draw a bar chart graph to show the relationship between the population of Lichen against the directions facing on the tree. The population of Lichen is represented by the total surface area covered in the quadrat. Based on the graph in 1 (e)(ii), explain the relationship between the population distribution of Lichen and the light intensity. State the operational definition for population distribution of Lichen. Lightning strike the tree and cause the tree to fall. The Lichen under study is then exposed to direct sunlight from 7.00 a.m. to 6.00 p.m. daily. Predict what will happen to the total surface area covered by Lichen after a month. Explain your prediction. 20

21 (i) The following is a list of biotic and abiotic factors. ph of water, pigeon orchid, humidity, bird, temperature, Elodea sp. Classify these factors in the Table. Abiotic factors Biotic factors Table 21

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23 Question 4 : No. Questions Marks Student notes 4 An experiment was carried out to investigate the water pollution level or BOD in three different locations from a suspected polluted Rivers. Three water samples are collected from these three locations and labelled as P, Q and R as in Diagram ml of each sample is put in a reagent bottle and added with 1 ml of 0.1% methylene blue solution. All the bottles are kept in dark cupboard. Observations are made every minute to see the changes in the methylene blue colour. Sample P Sample Q Sample R Table 1 shows the results of this experiment. Diagram 1 Each sample is added with methylene blue solution Water sample P Q R Time taken for methylene blue solution become colourless Table 1 2

24 No. Questions Marks Student notes (a) Record the time taken for methylene blue solution become colourless in the boxes provided in Table 1. (b) (i) Based on Table 1, state two different observations. Observation 1 : Observation 2 : (ii) State the inferences which corresponds to the observations in 1(b)(i). Inference 1 : Inference 2 : 24

25 (c) Complete Table 2 based on this experiment. Variable Method to handle the variable Manipulated variable: Responding variable: Controlled variable : Table 2 (d) State the hypothesis for this experiment. (e) (i) Construct a table and record all the data collected in this experiment based on the following criteria: Water sample Time taken 25

26 (f) (g) (h) (i) Based on the data in 1(e) draw a bar chart of time taken for methylene blue solution become colourless against water samples. What is the relationship between time taken, oxygen concentration and BOD value of water in this experiment? Based on the result of this experiment, state the operational definition for BOD. This experiment is repeated by using water sample from chicken farm areas. Predict the time taken for methelyne blue to become colourless. 26

27 (j) Arrange the water samples from the most polluted to the least polluted. 27

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29 Question 5 : No. Questions Marks Student notes 5 Transpiration is the evaporation of water from a plant to the surroundings. The rate of transpiration is affected by environmental factors such as temperature. A group of students carried out an experiment to study the effect of temperature on the rate of transpiration. Diagram 1 shows the set up of the apparatus. An air bubble was trapped in the capillary tube. The apparatus was placed in an air-conditioned room at 20 o C. The time taken for the air bubble to move a distance of 10 cm was recorded. The experiment was repeated for a second time to get average readings. The experiment is repeated by placing the apparatus at three more different temperatures: an air-conditioned room at 25 o C, an air-conditioned room at 0 o C and in a non airconditioned room at 5 o C. Diagram 1 Table 1 shows the reading of stopwatch for air bubble to move a distance of 10 cm at different temperature 29

30 Temperature o C Time taken for air bubble to move a distance of 10 cm (min) First reading Second reading Average Reading

31 Temperature Suhu o C Time taken for air bubble to move a distance of 10 cm (min) First reading Second reading Average Reading 0 5 No. Questions Marks Student notes (a) Record the time taken for the air bubbles to move a distance of 10 cm and average reading in Table 1. (b) (i) Based on Table 1, state two different observations. Observation 1 : 1

32 Observation 2 : (ii) State the inferences which corresponds to the observations in 1(b)(i). Inference 1 : Inference 2 : 2

33 (c) Complete Table 2 based on this experiment. Variable Manipulated variable: Method to handle the variable Responding variable: Controlled variable : Table 2 (d) State the hypothesis for this experiment.

34 (e) (i) Construct a table and record all the data collected in this experiment. Your table should have the following aspects: - Temperature - Average time taken for air bubbles to move a distance of 10 cm. - Rate of transpiration Rate of transpiration = Distance Time (e) (f) (ii) Using the data in 1(e)(i), draw the graph of the rate of transpiration against the temperature Based on the graph in 1(e)(ii), explain the relationship between the rate of transpiration and temperature. (g) Based on the result of this experiment, state the operational definition for process of transpiration. 4

35 (h) If the surface of the leaves of a plant at temperature of 5 o C are covered with vaselin, predict the time taken for air bubble to move a distance of 10 cm. Explain your prediction. (i) The following list is a factor that affecting transpiration. Relative humidity cuticle air movement stomata light intensity Kelembapan relatif kutikel pergerakan angin stomata keamatan cahaya Classify the factors into two group in Table. Environmental factor Morphology factors Table 5

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