Why is Auxin not considered a hormone, but a growth substance (2 marks)

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killerspeedforce
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Trumbles
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What level or syllabus is this for? Most syllabuses do consider auxin to be a hormone (or auxins as a family of hormones).

There's a bit of useful info here if you scroll down to "Is auxin a hormone".
https://bmcbiol.biomedcentral.com/ar...915-016-0291-0
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killerspeedforce
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(Original post by Trumbles)
What level or syllabus is this for? Most syllabuses Eeddo consider auxin to be a hormone (or auxins as a family of hormones).

There's a bit of useful info here if you scroll down to "Is auxin a hormone".
https://bmcbiol.biomedcentral.com/ar...915-016-0291-0
Edexcel IGCSE June 2019.
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errrr99
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(Original post by Trumbles)
What level or syllabus is this for? Most syllabuses do consider auxin to be a hormone (or auxins as a family of hormones).

There's a bit of useful info here if you scroll down to "Is auxin a hormone".
https://bmcbiol.biomedcentral.com/ar...915-016-0291-0
genius! in summary of the link: auxin is neither a hormone nor a morphogen, because it does not fit the precise definition of either
it is not produced in a specific tissue; its actions are too varied (pleiotropic) to be considered a specific hormone; it is really a signal that triggers a pre-set system

and it is not really a morphogen despite having some gradient-dependent effects because of cross-feedback with different signalling systems and because cells respond in unique and non-uniform ways

phytohormone may be the best word to use for auxin
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Exdoz
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(Original post by killerspeedforce)
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Because:
- Hormones don't affect the cells/glands that produce it. Auxin affects the shoot cells in plants- the ones that produce it
- A hormone has an effect only on a specific part of the organism but auxin affects the shoots and the roots- it is not entirely specific
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Exdoz
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(Original post by Trumbles)
What level or syllabus is this for? Most syllabuses do consider auxin to be a hormone (or auxins as a family of hormones).

There's a bit of useful info here if you scroll down to "Is auxin a hormone".
https://bmcbiol.biomedcentral.com/ar...915-016-0291-0
Auxin is a family of growth factors. I believe for GCSE they just refer to auxin as a growth factor (maybe a hormone I can't remember) but in A-levels, it is knows as a group of growth factors.
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Trumbles
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The one thing that's still a bit of a mystery is how this relates to Edexcel IGCSE.

The specification for that doesn't say anything about how auxin is classified (although obviously it mentions hormones in other contexts; it doesn't mention 'growth factors' anywhere.) The revision guides, on the other hand, specifically refer to auxin as a hormone. E.g. CGP:
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