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internal assessment snail

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Introduction

ZUBAIR ABDUR RAHIM BIN AHMAD M08L TITLE To investigate the rate of respiration in small terrestrial animals RESEARCH QUESTION What is the different between the rate of respiration of snail and the rate of respiration of cricket? INTRODUCTION During respiration, oxygen is used while energy and carbon dioxide are produced. For each molecule of oxygen used, one molecule of carbon dioxide is released. If respiration occur in a closed system and dense with water, there should be no change in gas volume. However a decrease in the gas volume can occur if sodium hydroxide or potassium hydroxide is used to absorb carbon dioxide. The decrease in volume caused by absorption of carbon dioxide should equal the amount of oxygen used in respiration. HYPOTHESIS The rate of respiration of cricket will be higher compared to the rate of respiration of snail. This is because cricket is much active compared to snail in nature. Active animal will used more energy to support their activities. ...read more.

Middle

DATA COLLECTION 1) Qualitative data a. The snails move very slowly and they are very inactive. b. The crickets move actively and jump energetically. c. The colour of the potassium hydroxide remains colourless at the end of the experiment. d. The crickets are more passive at the end of the experiment. 2) Quantitative data O2 used, ml � 1.0 Weight g � 0.001 g Time, min � SNAILS No, reading, 3.00 2.00 20.25 19.28 27.83 15 15 15 Average 2.5 23.56 15 CRICKETS 2.0 2.0 3.0 3.47 3.46 4.35 15 15 15 Average 2.3 3.76 15 Data Processing Average = 02 used(ml)� 1.0ml Weight(g) � 0.01g Time(minutes) Rate of respiration (ml g-1 min-1) Snails : 1st No reading 20.25 15 - 2nd 3.0 19.28 15 0.010 3rd 2.0 27.83 15 0.005 Average 2.5 23.56 15 0.008 Crickets : 1st 2.0 3.47 15 0.038 2nd 2.0 3.46 15 0.039 3rd 3.0 4.35 15 0.046 Average 2.3 3.76 15 0.041 Table 3: Amount of oxygen used and the weight of the animals DISCUSSIONS 1. ...read more.

Conclusion

2. Firstly both animals are trapped in the boiling tube. Consequently the animals don't feel it like their environment and this may affect the rate of respiration. Therefore, a bigger container should be used to keep the animals. A bigger container may help to settle down better. Hence, respiration rate will be more accurate. 3. Secondly, the experiments are only done twice. Consequently, the result will be inaccurate. Therefore, in order to get better result, the experiments should be done more than that. 4. Thirdly, snails usually live in humid place. However, in the boiling tube, the humidity is different. Hence this will affect the rate of respiration because snails exchange the gaseous through the skin. Therefore, water should be dropped on the skin before starting the experiment. 5. Lastly, the usage of the manometer is not accurate to measure the change of the volume of carbon dioxide. Therefore, manometer should be replaced with respirometer which can give a better result. CONCLUSION The rate of respiration for cricket is higher compared to the rate of respiration for snail since cricket is more active compare to the snail. ...read more.

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