Ethylene: Discovery, Occurrence and its Functions MCQ - Practice Questions with Answers
Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET
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11 Questions around this concept.
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MEDIUM The commercial precursor of ethylene is
Who of the following scientists observed that ethylene can alter the tropic responses of the roots?
Name the only plant growth hormone regulator.
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Which combination of gases is suitable for fruit ripening?
The ethylene signalling pathway is important for fruit ripening. Which one of the following responses is routinely used to identify ethylene signalling pathway components?
A ripe mango, kept with unripe mangoes causes their ripening. This is due to the release of a gaseous plant hormone
Concepts Covered - 1
Ethylene and Its Discovery
- Ethylene is a gaseous hormone which promotes the transverse growth but retards the longitudinal growth.
- H.H. Cousins (1910) confirmed the release of a volatile substance from ripened oranges that hastened the ripening of stored unripened bananas.
- Later this volatile substance was identified as ethylene, a gaseous PGR.
- Kerosene lamps and hay have been used by fruit merchants to hasten ripening in fruits.
- These effects are due to ethylene.
- Neljubow observed that ethylene can alter the tropic responses of the roots.
- Crocker et. al (1935) identified ethylene as the phytohormone.
- Ethylene is produced in the plants from the amino acid methionine.
- It is synthesized in roots, leaves, flowers, fruits and seeds.
- It is heavily synthesized in nodal regions.
- Maximum synthesis of ethylene occurs during the climacteric fruit ripening.
- Excess of auxin also induces ethylene synthesis. Many effects of excess auxin are actually the effects produced by ethylene.
- The commercial product for providing ethylene is ethephon (2-chloroethyl phosphoric acid).
- It is a liquid from which ethylene is released.
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