alleryEthylene is unique among plant hormones because it is
Aa fatty acid derivative
Ba peptide that travels in xylem
Cthe only gaseous plant hormone
Dthe only hormone produced exclusively in roots
Answer & Solution
Correct answer: C. the only gaseous plant hormone
Ethylene (C₂H₄) is the only gaseous plant growth regulator.
It is produced by ripening fruits and diffuses through the air to ripen nearby fruits, by senescing tissues, and by stressed plants.
The other classic hormones are non-gaseous organic molecules.
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