Paper 3 Question 2

Here are some possibilities of Question 2 PAPER3.

FROM CHAPTER 9: ENDANGERED ECOSYSTEM

1. Diagram 1 shows an area where different activities are being carried out. The river flowing at the area receives the wastes from the town and also from the factories. In conjunction with their studies of the effects of human activities on the environment, a group of students carried out an experiment to study the level of water pollution in three stations A, B and C, along the river.

Plan an investigation which you could carry out in the laboratory to determine the level of pollution in stations A, B and C.The planning of your experiment must include the following aspects:

● Problem statement

● Aim of investigation

● Hypothesis

● Variables

● List of apparatus and materials

● Technique

● Procedure

● Presentation of data

● Conclusion

FROM CHAPTER 8: DYNAMIC ECOSYSTEM

2.Interaction between the two components, the biotic and abiotic in an ecosystem produces a stable ecosystem.Based on the above information, design an experiment to investigate how the temperature does affects the growth of yeast.

The planning of your experiment must include the following aspects:

● Problem statement

● Aim of investigation

● Hypothesis

● Variables

● List of apparatus and materials

● Technique

● Procedure

● Presentation of data

● Conclusion

FROM CHAPTER 6; NUTRITION

3. The rate of photosynthesis is influenced by different environment factors. Based on the above situation; plan a laboratory experiment to determine the effect of temperature on the rate of photosynthesis.

The planning of your experiment must include the following aspects:

· Statement of identified problem

· Objective of study

· Variables

· Statement of hypothesis

· List of materials and apparatus

· Technique used

· Experimental procedure

· Presentation of data

· Conclusion

FROM CHAPTER 8: DYNAMIC ECOSYSTEM

4. The population of crow is increasing in Nilai Village due to the existence of dumping site. The villager complained the birds’ dropping caused corrosion to their vehicle paint.

A group of biologists decides to carry out a study to find out the population size of the crow before deciding the appropriate approach to overcome the problem faced by the community. The population size of crow in Nilai Village is compared to the population of crow in Kluang Village which is 10km away.

The planning of your experiment must include the following aspects:

● Problem statement

● Aim of investigation

● Hypothesis

● Variables

● List of apparatus and materials

● Technique

● Procedure

● Presentation of data

● Conclusion

FROM CHAPTER 7 : RESPIRATION

5. During vigorous exercise such as running, the muscles require more oxygen and glucose to release energy during cellular respiration. Therefore the rate of respiration and heartbeat change. Design an experiment to study the effect of vigorous exercise on the respiration and heartbeat rates.

The planning of your experiment must include the following aspects

• Problem statement

● Aim of investigation

● Hypothesis

● Variables

● List of apparatus and materials

● Technique

● Procedure

● Presentation of data

● Conclusion

FROM CHAPTER 6: NUTRITION

6. Plant needs macronutrients and micronutrients to grow healthy and reproduce. Nitrogen as in nitrate, phosphorus and potassium are most important.By using a suitable plant that can absorb nutrient from nutrient solution (aquaculture), design an experiment to show the effect of nitrogen, phosphorus and potassium deficiency on this plant.

Your experimental planning need to include the following aspects:

· Statement of identified problem

· Objective of study

· Variables

· Statement of hypothesis

· List of materials and apparatus

· Technique used

· Experimental procedures

· Presentation of data

* Conclusion

FROM CHAPTER 3; CHEMICAL COMPOSITION

7. A group of students did a study on the function of enzymes as an organic catalyst that can regulate and increase the rate biochemical reactions in the cell. Enzymes are very sensitive to a change in temperature and functions efficiently at an optimum temperature. Design an experiment to study the effect of different substrate concentration on the activity of salivary amylase on starch.

The planning of your experiment must include the following aspects:

· Statement of identified problem

· Objective of study

· Variables

· Statement of variables

· List of materials and apparatus

· Technique used

· Experimental procedure

· Presentation of data

* Conclusion