Gempur Paper 3 Set 1~SPM2009

ANSWER for Question 1 and 2- SET 1 GEMPUR PAPER 3~SPM 2009

QUESTION 1

1.(a)

(b)(i) . At a distance of 10 cm from the bulb, the length of gas bubble is 5 cm

2. At a distance of 50 cm from the bulb, the length of gas bubble is 1 cm

(ii)1. At low light intensity, Less gas is produced showing the low rate of photosynthesis.

2. At high light intensity, more gas is produced showing the high rate of photosynthesis.

(c)

(d)As the light intensity increases, the rate of photosynthesis increases.// As the distance of the plant from the bulb increases, the length of the air bubble increases

(e)(i)

(ii)

(f)As the distance increases, the rate of photosynthesis decreases, because the light intensity decreases and less gas is produced.

(g)Photosynthesis is the process that takes place in an aquatic plant. It requires light from the bulb and sodium hydrogen carbonate solution and produces gas bubbles.

(h)The length of gas bubbles increases more than 3 cm because the concentration of sodium hydrogen carbonate solution increases, more oxygen is produced.

(i)
QUESTION 2

Aim:To study the effect of temperature on the rate of enzyme reaction

Problem Statement:What are the effects of temperature on salivary amylase activity on starch?

Hypothesis: When the temperature increases, the rate of enzyme reaction increases.

Variables:

Manipulated : temperature of the reaction
Responding: the rate of enzyme reaction // the time taken for the hydrolysis of starch

Constant : volume of enzyme// concentration of enzyme

Apparatus &Materials: Beakers, test tube, thermometer,syringe, stopwatch, Bunsen burner, tripod, wire gauze, glass rod,starch, saliva, water bath, ice cubes, Iodine solution

Technique:Using stop watch to record the time taken for the complete hydrolysis of starch

Procedure:

1.Use a syringe to put 1 ml of 0.1% starch suspension into each of the test tubes : A1 and B1
2.Use another syringe to put 2 ml of saliva into each of the test tubes labelled A 2 and ,B2
3.Immerse test tubes A1 and A2 into water bath of cold water (10 0C C)
4.After 5 minutes of immersion, pour the starch suspension from test tube A1 into test tube A2. 5.Stir the mixture using a glass rod
6.Starts the stop watch.
7.Use a dropper to put a drop of mixture from test tube A2 onto the iodine solution in the first groove of the white tile
8.Repeat the iodine test for every minute for 10 minutes
9.Rinse the dropper after each sampling
10.Record the time taken for the hydolysis of starch
11.Keep the test tubes with the mixture in their respective water bath throughout the experiment
12.Repeat the experiment with warm water (37 0C)
13.Repeat experiment to get average reading

14.Record the result in a Table

Result:

Conclusion: When the temperature increases, the rate of amylase reaction increases.