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In ripening fruit, ethylene stimulates which conversion?
ASugars into starch and organic acids
BStarch and acids into simple sugars
CProteins into starch and amino acids
DStarch into cellulose and cell walls
Answer & Solution
Correct answer: B. Starch and acids into simple sugars
1. Ethylene is a volatile gas produced by ageing tissues and by the nodes of stems.
2. Its best known effect is the promotion of fruit ripening.
3. It does this by stimulating the conversion of starch and acids to sugars, which is why ripe fruit tastes sweet.
4. Running the conversion the other way, from sugars into starch, would make fruit less palatable rather than more.
5. Commercial fruit growers use applications of the gas to control the timing of ripening.
_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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