Biology benchmark 2 semester exam fall 24

The picture below shows a mimosa sleeve before and after it was pitched
Why did the mimosa sleep?Move the way it did when it was pinched
It is moving away from the pool of gravity
It is moving away from touch
It is moving towards touch
It is moving towards light

1 answer

In the context of plant movements, a mimosa plant (often referred to as Mimosa pudica) exhibits a characteristic response called thigmonasty, which is a rapid movement in response to touch. When the leaves of the mimosa are pinched or touched, they fold and droop, which is a defense mechanism to deter herbivores.

Given your options, the correct answer would be:

It is moving towards touch.

However, the mimosa's movement in response to touch doesn't imply that it is moving towards touch as in seeking it out; rather, it is a reactive response to contact. The main reason for the movement when the leaves are pinched is a rapid change in turgor pressure in the leaf cells.