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Ch. 37 - Plant Sensory Systems, Signals, and Responses
Freeman - Biological Science 8th Edition
Freeman8th EditionBiological ScienceISBN: 9780138276263당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Freeman 8th EditionCh. 37 - Plant Sensory Systems, Signals, and Responses문제 5
37장, 문제 5

Why was it logical to predict that amyloplasts function as statoliths?
a. They are dense and settle to the bottom of gravity-sensing cells.
b. They are present only in gravity-sensing cells.
c. They make a direct physical connection with membrane proteins that have been shown to be gravity-receptor molecules.
d. Their density changes in response to gravity.

검증된 단계별 안내
1
Understand the role of amyloplasts: Amyloplasts are organelles in plant cells that store starch. They are known to be involved in gravity sensing, particularly in root cells.
Define statoliths: Statoliths are specialized structures that help organisms sense gravity. In plants, they are thought to be involved in the perception of gravity by settling in response to gravitational pull.
Consider the properties of amyloplasts: Amyloplasts are dense due to the starch they contain, which makes them heavier than the surrounding cytoplasm.
Analyze the options: Option (a) suggests that amyloplasts settle to the bottom of gravity-sensing cells due to their density, which aligns with the behavior expected of statoliths.
Evaluate the logic: Since amyloplasts are dense and can settle in response to gravity, it is logical to predict that they function as statoliths, as this settling could trigger a response in the plant to orient itself according to gravity.

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주요 개념

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Amyloplasts

Amyloplasts are non-pigmented organelles found in plant cells, primarily responsible for the synthesis and storage of starch granules. They are dense structures that can settle within cells, making them potential candidates for gravity sensing due to their ability to move in response to gravitational forces.
추천 영상:
가이드 코스
05:39
Gravitropism

Statoliths

Statoliths are specialized organelles or structures within cells that help organisms sense gravity. In plants, they are typically dense particles that can move within gravity-sensing cells, providing positional information that aids in the plant's orientation and growth direction relative to gravity.
추천 영상:
가이드 코스
05:39
Gravitropism

Gravity Sensing in Plants

Gravity sensing in plants involves the detection of gravitational forces to orient growth and development. This process often relies on the movement of dense organelles like amyloplasts within specialized cells, which interact with membrane proteins to trigger signaling pathways that adjust the plant's growth direction.
추천 영상:
가이드 코스
07:47
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d. If roots are dry, the ABA concentration in leaf cells drops dramatically.

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