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Ch. 37 - Plant Sensory Systems, Signals, and Responses
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All textbooksFreeman 8th EditionCh. 37 - Plant Sensory Systems, Signals, and ResponsesProblem 12

Chapter 36, Problem 12

Leaflets of Mimosa pudica (common names: sensitive plant, touch-me-not) have a remarkable ability to close up in response to being touched or physically moved. How fast can the leaflets close? How does this occur? And more importantly, what benefit could this unusual response provide to the plant? Which of the following terms best describes the leaflet movement? a. thigmonastic movements b. thigmotropism c. thigmomorphogenesis d. apical dominance

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Hello everyone and welcome to today's video. So the venus flytrap responds to touch by closing its leaves. Once the insect is digested and the stimulus is removed, it again opens its leaves, restoring it to its original position. This response of flytrap is called. Which of the following answer choices. Remember that each of these answer choices are going to represent a type of movement that is dependent on just different things depending on the answer choice. So let's begin by answer choice. A gravity trumpism. Well according to its prefects, gravity is going to be referring to movement in the direction or in response to gravity nowhere in the question do we see the word gravity and it is stated that is a response to a stimulus of touch because of this. We're going to cancel it out. Then we have thick mo trumpism or thick mo trumpism is going to be actually a response to touch. However, something very important about techno trumpism is that it is a directional response, so it is going to be in the direction of where this touch stimulus is coming from. The way that the venus flytrap works, it is not going to be going in the direction of the stimulus, it is more of an open and then close type of response that is non directional because of this trope is um is not what we're going to be seeing here and we're going to cancel it out. Then we have photo trumpism. This prefix photo is going to indicate light so it is a response or just movement in response to light. This is not what we're seeing in the question so we're going to cancel it out and then we have nasty movement, nasty movement is a type of response that is non directional and it can be in response to many different types of stimulus. It does not need to be a specifically touch, Although touch is included because we specified that the venus flytrap has a non directional type of movement by opening and close its trap. Monastic movement or option C. Is going to be the correct answer to our question. I really hope this video helped you and I have to see you on the next one.
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Textbook Question

Leaflets of Mimosa pudica (common names: sensitive plant, touch-me-not) have a remarkable ability to close up in response to being touched or physically moved. How fast can the leaflets close? How does this occur? And more importantly, what benefit could this unusual response provide to the plant? Researchers studied the rate of closing and reopening of leaflets by measuring changes in the distance between opposing leaflets after being touched. Their results are shown in the accompanying graph (d/dmax is actual leaflet distance relative to maximal leaflet distance). How long does it take for leaflets to close? How long to reopen?

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Textbook Question

Leaflets of Mimosa pudica (common names: sensitive plant, touch-me-not) have a remarkable ability to close up in response to being touched or physically moved. How fast can the leaflets close? How does this occur? And more importantly, what benefit could this unusual response provide to the plant? The mechanism of leaflet closure is similar to what happens during the shrinking of guard cells and closing of stomata (see Figure 37.22). When in the open position, special cells on the upper surface of Mimosa leaflets are filled with water and are under pressure. Explain how osmosis and flow of ions into and out of these special cells may be involved in leaflet closure and reopening.

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Textbook Question

Leaflets of Mimosa pudica (common names: sensitive plant, touch-me-not) have a remarkable ability to close up in response to being touched or physically moved. How fast can the leaflets close? How does this occur? And more importantly, what benefit could this unusual response provide to the plant? If just the leaflets located toward the end of a leaf are touched, the adjacent leaflets close in fairly rapid succession until all leaflets on a leaf close up. Explain how electrical signaling may be involved in this response.

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Textbook Question

Leaflets of Mimosa pudica (common names: sensitive plant, touch-me-not) have a remarkable ability to close up in response to being touched or physically moved. How fast can the leaflets close? How does this occur? And more importantly, what benefit could this unusual response provide to the plant? Researchers have hypothesized that rapid leaf movements in Mimosa serve as a defense mechanism (e.g., closing leaflets may deter plant-eating insects). Propose an experiment to test this hypothesis.

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