BIOLOGY PAPER 3 (2003-2010)

YEAR	QUESTION 1	QUESTION 2
2003	To study the effect of camouflage on a predator-prey relationship [Chapter 8]	To study the relationship between the concentration of CO2 and the rate of photosynthesis [Chapter 6]
2004	To determine the % of vitamin C in fruit juices using DCPIP solution [Chapter 6]	To estimate the size of the bird population [Chapter 8]
2005	To determine and compare the energy content in white bread and peanuts [Chapter 6]	To determine the concentration of the solution which will maintain the mass of plant tissues. [Chapter 3]
2006	To study the effect of concentration of albumen suspension on the rate of reaction of pepsin enzyme [Chapter 4]	To determine concentration of sucrose which is isotonic to cell sap of mango [Chapter 3]
2007	To study the effect of light intensity on the rate of photosynthesis of a Hydrilla sp. [Chapter 6]	To study the effect of temperature on the rate of anaerobic respiration in yeast [Chapter 7]
2008	To investigate the effect of light intensity on the population distribution of Pleurococcus sp. [Chapter 8]	To study the size of molecules that can diffuse through a semi permeable membrane [Chapter 3]
2009	To study the effect of light intensity on the rate of photosynthesis. [Chapter 6]	To study the effect of temperature on the rate of enzyme reaction. [Chapter 4]
2010	To investigate the effect of different duration of activity on the percentage of CO2 in exhaled air [Chapter 7]	To study the effect of interspecific competition between maize and paddy plants on their growth. [Chapter 8]

EXPERIMENT CHECKLISTS

No	Topic
	Refer to Biology Practical Book
	FORM 4
1	Chapter 3: Movement of substance across plasma membrane Act 3.1 : Size of molecule that can diffuse through a semipermeable membrane (pg 20)
2	Chapter 3: Movement of substance across plasma membrane Act 3.2 : Studying osmosis using osmometer (pg 23)
3	Chapter 3: Movement of substance across plasma membrane Act 3.4 & 3.5 : Studying the effects of hypotonic, hypertonic and isotonic solutions on animal and plant cells (pg 27-29)
4	Chapter 3: Movement of substance across plasma membrane Act 3.6: Determining the concentration of external solution which is isotonic to the cell sap of plant (pg 30)
5	Chapter 4 : Chemical composition of the cell Act 4.3 : Studying the effects of temperature on salivary amylase activity (pg 36)
6	Chapter 4 : Chemical composition of the cell Act 4.4 : Studying the effects of pH on the activity of pepsin (pg 39)
7	Chapter 4 : Chemical composition of the cell Act 4.4 : To investigate the effects of pH on the breakdown of starch by amylase (pg 41)
8	Chapter 4 : Chemical composition of the cell Act 4.5: Studying the effects of substrate concentration on salivary amylase activity (pg 42) (SPM : Concentration of albumen)
9	Chapter 4 : Chemical composition of the cell Act 4.6: Studying the effects of enzyme concentration on salivary amylase activity (pg 43)
10	Chapter 6 : Nutrition Act 6.1: Determining the energy value in food samples (pg 61)
11	Chapter 6 : Nutrition Act 6.3: Determining the vitamin C contain in various fruit juice. (pg 65)
12	Chapter 6 : Nutrition Act 6.8 : Studying the effects of macronutrient deficiency in plants (pg 72)
13	Chapter 6 : Nutrition Act 6.11: Investigating the effects of light intensity on the rate of photosynthesis. (pg 76)
14	Chapter 6 : Nutrition Act 6.11: Investigating the effects of carbon dioxide concentration on the rate of photosynthesis (pg 76)
15	Chapter 7 : Respiration Act 7.2 : Investigating the process of anaerobic respiration in yeast (page 85)
16	Chapter 7 : Respiration Act 7.6: Investigating the differences between inhaled and exhaled air in terms of oxygen and carbon dioxide contents (pg 93)
17	Chapter 8 : Dynamic ecosystem Act 8.3 :Studying the intraspecific and interspecific competition in plants
18	Chapter 8 : Dynamic ecosystem Act 8.5 : Investigating the distribution of plants using the quadrat sampling technique (pg 111) Modified (using Grid)
19	Chapter 8 : Dynamic ecosystem Act 8.6: Estimating the population size of animals using capture, mark, release and recapture technique (pg 113)
20	Chapter 8 : Dynamic ecosystem Act 8.7 : Studying the relationship of population distribution of an organism with the changes of an abiotic factor
21	Chapter 8 : Dynamic ecosystem Act 8.11: Studying the effects of temperature, pH, light intensity and nutrients on the activity of yeast (pg 119)
22	Chapter 9 : Endangered ecosystem Act 9.2: Investigating the level of pollution in several different sources of water (pg 128)
	FORM 5
1	Chapter 1: Transport Act 1.10 : To study one of the factor affecting the rate of transpiration. (pg 19)
2	Chapter 3: Coordination and response Act 3.4 : To study the effect of different quantities of water intake of urine output (pg 50)
3	Chapter 4: Reproduction and Growth Act 4.11 : To study the growth of a plant such as an onion or a balsam (pg 74)
4	Chapter 6: Variation Act 6.1 : To investigate continuous variation and discontinuous variation in human.(pg 99)
5	Chapter 6: Variation Act 6.4 : To investigate the importance of camouflage in the survival of a species (pg 106)

Vitamin C content in fruit juices

Please read either from Hands on Pg 55 /the sample experiment plan given below :

Objective	To determine the vitamin C content in pineapple, lime and orange juice.
Problem statement	Which fruit juice contains the highest concentration /percentage of vitamin C?
Hypothesis	Lime juice contains higher concentration/percentage of vitamin C compared to pineapple juice and orange juice.
Variables	Manipulated : Types of fruit juice
	Responding : Concentration/percentage of vitamin C in fruit juices
	Constant : Volume of fruit juices/concentration of DCPIP solution/ Standard concentration of ascorbic acid solution
Apparatus and materials	Materials : freshly prepared pineapple, lime and orange juices, 0.1% ascorbic acid solution, DCPIP solution Apparatus : 5ml syringe(with needle), 1ml syringe, specimen tubes, 5ml measuring cylinder
Technique	Measure and record the volume of fruit juice needed to decolourise 1 ml DCPIP using a syringe// Calculate the % of vitamin C in fruit juice by using formula : Vol of 0.1% ascorbic acid X 0.1 Volume of fruit juice OR Calculate the content of vitamin C in fruit juice by using formula : Vol of 0.1% ascorbic acid (mgcm-3) Volume of fruit juice
Procedure	1. 1 ml of DCPIP solution is placed in a specimen tube using a 1 ml syringe. 2. 5 ml syringe was filled with 5 ml of 0.1% ascorbic acid solution. 3. The needle of the 5 ml syringe was immersed into the DCPIP solution. 4. Ascorbic acid solution was added drop by drop until the DCPIP solution, and gently stirred with the needle of the syringe. (Do not shake the tube vigorously). 5. Ascorbic acid solution is added continuously until the DCPIP solution is decolourise. 6. The volume of ascorbic acid solution used measured using a syringe and recorded. 7. Steps 1-6 are repeated using fresh orange, pineapple and lime juice. 8. The volume of fruit juices required to decolourise the DCPIP solution in each fruit juice is measured using a syringe and recorded in a table. 9. The percentage and the concentration of vitamin C in each fruit juice are calculated using the above formula. Precaution: 1. The juice must be freshly prepared. 2. Do not shake the DCPIP too vigorously.
Recording data/ result	Solution/ fruit juice Volume of solution/fruit juice needed to decolourise 1 ml of DCPIP solution (ml) Percentage of vitamin C (%) Conc. of vitamin C (mg cm-3) 1 2 3 Average 0.1% ascorbic acid Pineapple juice Lime juice Orangejuice
Conclusion	Lime juice contains higher concentration/percentage of vitamin C compared to pineapple juice and orange juice. Hypothesis is accepted.