bahagian sekolah berasrama penuh dan ... - blog biology score biology 2011 1 bahagian sekolah...

Download BAHAGIAN SEKOLAH BERASRAMA PENUH DAN ... - Blog Biology   score biology 2011 1 bahagian sekolah berasrama penuh dan sekolah kecemerlangan kementerian pelajaran malaysia perfect score biology

Post on 13-Feb-2018

216 views

Category:

Documents

1 download

Embed Size (px)

TRANSCRIPT

  • PERFECT SCORE BIOLOGY 2011

    1

    BAHAGIAN SEKOLAH BERASRAMA PENUH DAN

    SEKOLAH KECEMERLANGAN

    KEMENTERIAN PELAJARAN MALAYSIA

    PERFECT SCORE BIOLOGY

    2011 Teachers Module

    PAPER 3

    QUESTION 1

  • PERFECT SCORE BIOLOGY 2011

    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

    glucose 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.

    Diagram 1.1

    DIAGRAM 1.2

    rubber tubing

    Manometer with

    coloured liquid

    Initial height of

    coloured liquid

    Boiling tube containing yeast

    suspension

    Glass tube

    clip

    Rubber stopper

    Initial height of coloured liquid :

    1 cm

  • PERFECT SCORE BIOLOGY 2011

    3

    Percentage concentration of glucose / %

    Final height of coloured liquid in the manometer after 10 minutes /cm

    10

    15

    20

    3

    5

    8

  • PERFECT SCORE BIOLOGY 2011

    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 . 1. At 10% concentration of glucose ,the final

    height of coloured liquid after 10 min is 3 cm 2. At 20% concentration of glucose , the final

    height of coloured liquid after 10 min is 8 cm

    (ii) State the inference which corresponds to the observation in 1(b(i). 1. Low activity of yeast in lower concentration of

    glucose, less carbon dioxide is released

    2. High activity of yeast in high concentration of glucose, more carbon dioxide is released

    (c) Complete Table 1.2 for the three variables based on the experiment.

    Variable

    Method to handle the variable

    Manipulated variable: The concentration of glucose

    Use different concentration of nutrients/glucose

    Responding variable: Height of coloured liquid// The rate of yeast activity

    Record the height of coloured liquid by using a metre rule // Calculate rate of yeast respiration using formula: = height of coloured liquid time

    Controlled variable : Volume of yeast suspension /mass of yeast/volume of glucose/pH/light intensity/temperature/time taken

    Fix the volume of 100cm3 of yeast suspension /the mass of 4 g of yeast /pH5 /light intensity at distance of 50cm /temperature at room temperature/time taken for 10 minutes

    3

    3

    3

  • PERFECT SCORE BIOLOGY 2011

    5

    (d) State the hypothesis for the experiment. The higher/ lower the concentration of glucose, the higher / lower the rate of yeast activity

    (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

    Percentage concentration of glucose (%)

    Height of coloured liquid

    (cm)

    The rate of the activity of yeast

    (cm/min)

    10 3

    0.3

    15 5

    0.5

    20 8

    0.8

    Table 1.1

    (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. When the concentration of glucose increases/decreases, the rate of yeast activity increases/decreases, more substrate for yeast to use for energy production, more yeast reproduced.

    (f) Based on the experiment, define anaerobic respiration in yeast operationally. An anaerobic respiration is when yeast using glucose to produce gas that causes the rising of liquid in manometer tube and the process is affected by concentration of glucose

    3

    3

    3

    3

    3

  • PERFECT SCORE BIOLOGY 2011

    6

    (g) The experiment is repeated by using 1 ml of 0.1 mol dm-3 of sodium hydroxide solution is added into the boiling tube. Predict the manometer reading after 10 minutes. Explain your prediction.

    1 cm, not increase, sodium hydroxide is alkali, the medium is not suitable for yeast.

    (h) The following list is part of the apparatus and material used in this experiment. Complete Table 1.3 by matching each variable with the apparatus and material used in the experiment.

    Variables

    Apparatus

    Material

    Manipulated

    Measuring cylinder

    Glucose

    Responding

    Coloured liquid

    Metre ruler

    Controlled

    electronic balance

    Yeast

    Yeast, metre rule, coloured liquid, electronic balance, glucose solution, measuring cylinder

    3

    3

  • PERFECT SCORE BIOLOGY 2011

    7

    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 Knops solution. Petri dish is filled with 20 ml Knops solution with different pH value and 5 Lemna sp. each. The Knops solution is treated by adding acid or alkali to achieve the pH value needed. ** Knops solution is a solution which contains essential nutrient for plants growth.

    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.

    3

    4

    Lemna minor

    Petri dish

    Knops solution

  • PERFECT SCORE BIOLOGY 2011

    8

    5

    5

    7

    8

    9

    11

    11

    5

  • PERFECT SCORE BIOLOGY 2011

    9

    13

    1

    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 .

    Able to state any two observations correctly according to 2 criteria:

    pH ( Manipulated Variable)

    Number of Lemna sp (Responding Variable) Sample answers: 1. At pH 2 (Knop solution), the number of Lemna sp is 4 2. At pH 8 (Knop solution), the number of Lemna sp is 11 3. At pH 12 ( Knop solution), the number of Lemna sp is

    1 4. At pH 12 (Knop solution), the number of Lemna sp

    grow is less than at pH 2/4/6/8/10 5. At pH 8 (Knop solution), the number of Lemna sp is

    more than at pH2/4/6/10/12 *1,2 &3 is a horizontal observation

    *4 & 5 is a vertical observation

    (ii) State the inferences which corresponds to the observations in 1(b)(i). Able to make one logical inference for each observation based on the criteria

    suitable abiotic factor

    Favourable for Lemna sp growth Sample answers:

    3

    3

    3

  • PERFECT SCORE BIOLOGY 2011

    10

    1. Strong acidic condition is not favorable for Lemna growth.

    2. Weak/slight alkaline // neutral condition is most favorable for Lemna growth.

    3. Strong alkaline is not favorable for Lemna growth. 4. Strong alkaline condition is the least favorable for

    Lemna growth compare with other conditions. 5. Neutral/Slight alkaline condition is the best/moss

    favorable condition for Lemna growth. *1,2 &3 is a horizontal inference *4 & 5 is a vertical inference

    (c) Complete Table 1.4 to show the variables involved in the experiment and how the variables are operated.

    Variables How the variables are operated

    Manipulated:

    pH

    Add/Use acid or alkali to the Knop solution to get different pH condition// Use pH solution: pH2, pH4, pH6, pH8, pH10,pH12 // change/alter the medium condition

    Responding:

    Number of Lemna sp

    Count and record the number of Lemna sp. plants after 7 days.

    Fixed:

    Light exposure /

    Volume of Knop solution

    Fix 12 hours light exposure every day /

    Maintain the volume at 20ml

    (d) State the hypothesis for this experiment.

    Able to state a hypothesis to show a relationship between the manipulated variable and responding variable and the hypothesis can be validated, based on 3 criteria:

    manipulated variable

    responding variable

    relationship Sample answer :

    1. In low pH, number of Lemna sp is less than in a higher pH.

    2. The higher pH the higher number of Lemna sp. 3. In a neutral condition the number of Lemna sp.

    3

    3

  • PERFECT SCORE BIOLOGY 2011

    11

    plants is the highest /the most. 4. The more alkali the medium is the less number of

    Lemna sp.

    (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.

    Able to draw and fill a table with all columns and rows