Wipe the inside of the maze with a cotton wool bud. Repeat steps 5 to 8 until you have results for 10 maggots. If a maggot stops moving, remove it from the maze and carry out another This experiment should give numbers turning left and right. This section of the maze could be used to investigate the effect of variables such as light by covering one side of the maze with black paper and then the other. Turn alternation in maggots Many animals show behaviour called turn alternation. This means if the animal is forced to turn in one direction it is more likely to turn in the opposite direction next time it has a choice. The maze can be uses to allow you to investigate whether maggots show turn alternation. Use the maze you made in Task 1, with barrier removed. D a maggot at point Z in the maze. Record whether the maggot turns left or right when it reaches the junction at Y. Repeat steps 2 and 3 until another 9 times. Record your data in a suitable table. Risk assessment Risk assessment and risk management are the responsibility of the centre. Trialling The practical should be trialled before use with students. Additional notes The Bluebottle flies hatching from the maggots are classed as statutory nuisance animals by DEFRA (listed in document Insects and Climate Change” March 2009). The maggots “Nuisance should therefore be killed (e.g. by placing in a freezer for a week) before wrapping securely and placing in a bin collected directly by refuse collectors. Animals that have been used in experimental work are regarded as animal by-products and as such should not enter the food chain. For disposal, the flies should be killed as described above, and placed in the normal refuse. See Hazcard 25 for Cobalt chloride papers, and found in self-indicating silica gel, causes skin sensitisation. The chemical is also potentially carcinogenic by inhalation. Students should use forceps to place the cobalt chloride paper in the choice chamber. Students should not directly handle the papers or self-indicating silica gel. A-level Biology required practical No. 10 Teachers’ Notes
Wipe the inside of the maze with a cotton wool bud. Repeat steps 5 to 8 until you have results for 10 maggots. If a maggot stops moving, remove it from the maze and carry out another This experiment should give numbers turning left and right. This section of the maze could be used to investigate the effect of variables such as light by covering one side of the maze with black paper and then the other. Turn alternation in maggots Many animals show behaviour called turn alternation. This means if the animal is forced to turn in one direction it is more likely to turn in the opposite direction next time it has a choice. The maze can be uses to allow you to investigate whether maggots show turn alternation. Use the maze you made in Task 1, with barrier D removed. a maggot at point Z in the maze. Record whether the maggot turns left or right when it reaches the junction at Y. Repeat steps 2 and 3 until another 9 times. Record your data in a suitable table. Risk assessment Risk assessment and risk management are the responsibility of the centre. Trialling The practical should be trialled before use with students. Additional notes The Bluebottle flies hatching from the maggots are classed as statutory nuisance animals by DEFRA (listed in document “Nuisance Insects and Climate Change” March 2009). The maggots should therefore be killed (e.g. by placing in a freezer for a week) before wrapping securely and placing in a bin collected directly by refuse collectors. Animals that have been used in experimental work are regarded as animal by-products and as such should not enter the food chain. For disposal, the flies should be killed as described above, and placed in the normal refuse. See Hazcard 25 for Cobalt chloride papers, and found in self-indicating silica gel, causes skin sensitisation. The chemical is also potentially carcinogenic by inhalation. Students should use forceps to place the cobalt chloride paper in the choice chamber. Students should not directly handle the papers or self-indicating silica gel. A-level Biology required practical No. 10 Teachers’ Notes