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Taxis and Kinesis

Age 11-14 (KS3)
Age 14-16 (KS4 / GCSE)
Age 16-18 (A-level)

Introduces taxis and kinesis responses in flatworms/woodlice/maggots. I assume that students will have done the choice chamber experiments (an adapted version of which accompanies the powerpoint). The spreadsheet makes data analysis easier (save it as a template to avoid students ovewriting it).



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Published 01 Jan 2010

Contributed by Toby Tufton — Experienced contributor

2 people are following this contributor Average rating: 1 2 3 4 5

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Anonymous

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Abigail Laing - Admin

This is a superb resource. The presentation is beautifully designed with clear, concise information and plenty of visual stimuli – top quality photographs and diagrams. This would be a great resource in itself, but there’s the added bonus of a worksheet (also presented to a high standard) and practical activity, with an excel sheet all set up to present results on a graph.

Useful? Yes / No 1 2 3 4 5

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Extracts from this resource

TK Responses

1Taxis & KinesisResponses to stimuliQuit2Taxis & KinesisKinesis (means movement) Keep moving in unfavourable conditions Taxis Move towards or away from stimulus next 3Light onLight offDendrocoelum lacteumPhototaxis or Photokinesis ? How does it help ? Why does effect decrease ? nexthttp://commons.wikimedia.org/wiki/File:Planaria_Jar.jpg4Taxis & KinesisResponses to stimuliQuit5http://commons.wikimedia.org/wiki/File:Woodlice_02.JPG6Choice Chamber What choices could you set up? nexthttp://upload.wikimedia.org/wikipedia/commons/a/a4/Isopoda_fg01.JPGPetri DishGauzeHole to introduce woodlouse7How would you record this trace? What do marks show? How would you demonstrate kinesis/taxis?http://upload.wikimedia.org/wikipedia/commons/a/a4/Isopoda_fg01.JPG8Light vs. Dark How would you carry out experiment? How would you analyse results?http://upload.wikimedia.org/wikipedia/commons/a/a4/Isopoda_fg01.JPG9Chi-squared test 2 = 4.84 d.f. = 1 Critical value = 3.84 p<0.05 Results significantly different from null hypothesishttp://upload.wikimedia.org/wikipedia/commons/a/a4/Isopoda_fg01.JPG10Does this prove kinesis? nexthttp://upload.wikimedia.org/wikipedia/commons/a/a4/Isopoda_fg01.JPG11Why do woodlice avoid light? Heat / Desiccation Food Avoid predation Find other woodlice Woodlice congregate Why? Reproduction Communication Microclimate How could you modify experiment? nextTT12Taxis & KinesisResponses to stimuliQuit13http://www.flickr.com/photos/mzaluska/775006869/sizes/l/14Fly Calliphora next http://commons.wikimedia.org/wiki/File:Domestic_fly_head.jpg15Larvae show phototaxis? Positive or negative? Age specific? next http://commons.wikimedia.org/wiki/File:Decomposing_possum.jpg16AnteriorPosteriornext17Area of receptor cellsPharyngeal skeleton (Impermeable to light)

TK Maggots

Phototaxis & kinesis responses in maggots Adapted from John Cheverton (1996) ASAB Feedback 5 http://asab.icapb.ed.ac.uk/practicals/phototaxis_maggots.html Background information Blowfly (Calliphora) flies lay eggs on animal carcasses, which the maggots burrow into as they feed. Later they emerge from the carcass, and crawl away to pupate, usually in the soil or a safe crevice. The method described here aims to discover whether maggots show phototaxis, photokinesis, or both. It is designed to allow statistical analysis of both responses using the (2 test. Practical requirements Darkened room, with individual shaded lamps Avoid having lights on different tables facing in opposite directions Shallow plastic tray, large enough to hold a sheet of A4 paper Sheet of A4 paper, marked out as shown on next page. 20 fresh maggots per group, in a Petri dish. Spare dish. If refrigerated, allow the maggots at least 30 minutes to reach room temperature. Stopwatch and water-soluble marker pen. Ruler

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