The leaves of Mimosa pudica plants are made of a number of structures known as pinnae. The pinnae fold when the leaf is touched. This closes the leaf. Fig. 4.1 shows an open leaf of $$\(M\)$$. pudica before it is touched. Fig. 4.2 shows the same leaf that has closed after being touched. A open (not touched) B closed (touched) Fig. 4.1 Fig. 4.3 The leaves of $$\(M\)$$. pudica and the leaves of Venus fly traps move in response to touch stimuli, but the mechanisms that cause the responses are different. Describe the differences between the mechanism shown in Fig. 4.3 and the mechanism that causes the closure of the modified leaves in Venus fly traps. ............................................................................................................................................... . ............................................................................................................................................... . ............................................................................................................................................... . ............................................................................................................................................... . ............................................................................................................................................... . ............................................................................................................................................... . .........................................................................................................................................

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