The responses ofDasychone cingulata grube to photic stimulation
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1. When kept in light,Dasychone cingulata Grube exhibits two types of movements: (i) complete retraction into the tube and (ii) movement of the branchial crown or branchial filaments.
2.Dasychone contracts into its tube when a shadow is passed on it. This behaviour is more pronounced in the higher intensities than in the lower intensities of light. It not only responds to a decrease but also to an increase in intensity and the contraction to a passing shadow is greater in a white background than in a black background.
3. Adaptation to continuous passing of shadows is rapid. Dark adapted forms readily respond to shadow than the light-adapted forms and the duration of adaptation in any particular intensity is also correlated to it.
4. The range of spectral sensitivity is wide inDasychone but is least sensitive in red light.
5. The above experimental results as well as the significance of the contraction ofDasychone into its tube have been discussed.
KeywordsWhite Background Giant Axon Photic Stimulation Sudden Contraction Branchial Crown
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