Habituation of snail.
To investigate the effect of habituation of snails to a stimulus
To develope certain experiment skills, such as working safely, producing valid results, recording results and drawing valid conclusions from results.
Figure 1: Garden snail
Taken from http://abugblog.blogspot.com/2011/05/handsome-snail.html
Snails are one of the earliest known types of animals in the world. There is evidence that they evolved more than 600 million years ago. They are able to adapt to a variety of living conditions and they don’t require large amounts of food. They have been able to continually evolve to survive the…show more content… The snail is allowed to acclimatize to its new surroundings for a few minutes and its acclimatization is indicated when its head has fully-emerge from its shell.
2. A clean cotton wool bud is dampened with water.
3. Between the eye stalks the snail is firmly touched with the dampened cotton wool bud and the stopwatch is immediately started. The length of time between the touch and the snail being fully emerged from its shell once again, with its eye stalks fully extended is measured.
4. As soon as the eye stalks fully reappeared, steps 3 to 5 is repeated for a total of 10 touches, and how long the snail takes to re-emerge each time is timed.
5. The results is recorded in a suitable table and presented in an appropriate graph.
The number of stimulations
The time taken for eye stalks to emerge from the head of the snail/ seconds, s
Table 1: Time taken for eye stalks to emerge from the head of the snail for 10 touches of stimulus
Graph 1: Graph of time taken for snail to fully re-emerge from its shell against number of stimulation
From the graph, we can see that the snail showed the habituation response towards stimulus. During the first touch, the time taken for the snail’s both eyes to fully re-emerge was 26 s. The duration of time taken continue to decrease as the number of touches received