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Question
Which of the following is a gaseous hormone?
Which of the following is a gaseous hormone?
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Solution
The correct option is B Ethylene
Ethylene is a volatile compound and the only gaseous plant growth hormone which is mainly found in ripening fruits, flowers and leaves. Its unsaturated nature and small structure make it a volatile compound. It is responsible for fruit ripening and induction of leaf senescence. This makes option B correct. Auxins are growth hormones that stimulate growth by cell division and cell elongation. They are synthesized in shoot and root tip and are also used as weedicide that selectively acts against certain weeds. Auxins includes IAA, IBA and 2,4-D which are complex compounds and are not gaseous. Cytokinins stimulate cell division, even in non-meristematic cells, in presence of auxin. They are most abundant in the growing tissues which are active site of cell division, for example: root, embryos, fruits etc. They are substituted adenosine compounds and are not gaseous. Gibberellins are hormones of bolting (stem elongation) and reversal dwarfism by increasing the internodal length. They are tetra carbocyclic compounds with characteristic gibbane skeleton having four rings of carbon and hence are not gaseous hormones. Thus, the correct answer is option B.
Ethylene is a volatile compound and the only gaseous plant growth hormone which is mainly found in ripening fruits, flowers and leaves. Its unsaturated nature and small structure make it a volatile compound. It is responsible for fruit ripening and induction of leaf senescence. This makes option B correct. Auxins are growth hormones that stimulate growth by cell division and cell elongation. They are synthesized in shoot and root tip and are also used as weedicide that selectively acts against certain weeds. Auxins includes IAA, IBA and 2,4-D which are complex compounds and are not gaseous. Cytokinins stimulate cell division, even in non-meristematic cells, in presence of auxin. They are most abundant in the growing tissues which are active site of cell division, for example: root, embryos, fruits etc. They are substituted adenosine compounds and are not gaseous. Gibberellins are hormones of bolting (stem elongation) and reversal dwarfism by increasing the internodal length. They are tetra carbocyclic compounds with characteristic gibbane skeleton having four rings of carbon and hence are not gaseous hormones. Thus, the correct answer is option B.
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