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Which organelles settle downward in gravity sensing cells and are also called statoliths?
AChloroplasts
BMitochondria
CAmyloplasts
DPeroxisomes
Answer & Solution
Correct answer: C. Amyloplasts
1. Gravitropism needs a dense particle that can fall inside a cell and report which way is down.
2. Amyloplasts, also known as statoliths, are specialised plastids containing starch granules that settle downward in response to gravity.
3. They occur in shoots and in specialised cells of the root cap.
4. When a plant is tilted the statoliths drop to the new bottom cell wall, and growth turns vertical a few hours later.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 30 "Plant Form and Physiology", section 30.6 Plant Sensory Systems and Responses_
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