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==Key Stage 4Foundation==
===Meaning===
[[Auxin]] is a [[Plant HormonesHormone|plant hormone]] that causes [[Plant Cell|plant cells]] to elongate.
===About Auxin===
: [[Auxin]] is [[photophobic]] so it will build up on the darker side of a [[plant]]. This causes [[Cell (Biology)|cells]] on the shaded side of a [[plant]] to elongate, bending a [[shoot]] towards the source of [[light]].
: [[Auxin]] is found in high [[concentration]]s in [[shoot]] tips.
==Key Stage 4 Higher==
===Meaning===
[[Auxin]] is a [[Plant Hormone|plant hormone]] that causes [[Plant Cell|plant cells]] to elongate.
===About Auxin===
: [[Auxin]] is [[photophobic]] so it will build up on the darker side of a [[plant]]. This causes [[Cell (Biology)|cells]] on the shaded side of a [[plant]] to elongate, bending a [[shoot]] towards the source of [[light]].
: [[Auxin]] is found in high [[concentration]]s in [[shoot]] tips.
===Using Auxin===
: Gardeners use [[auxin]] to encourage cuttings of [[plant]]s to grow new [[root]]s when they are planted.
: [[Auxin]] can be used to kill [[plant]]s by causing them to grow too fast, using up their stores of [[energy]]. Since auxin is sprayed on [[leaf|leaves]], [[plant]]s with larger [[leaf|leaves]] will [[Absorb (Biology)|absorb]] more and are more likely to die.
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/0008158754/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158754&linkCode=as2&tag=nrjc-21&linkId=27ad53b0283feeff7fc5ae04a9e205f61 ''Auxin, page 220-5, GCSE Biology; Student Book, Collins, AQA '']
:[https://www.amazon.co.uk/gp/product/0198359373/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359373&linkCode=as2&tag=nrjc-21&linkId=952a73bbb09d222ecc4b50d200679849 ''Auxin, pages 176-179, GCSE Biology; Third Edition, Oxford University Press, AQA '']
:[https://www.amazon.co.uk/gp/product/1471851338/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851338&linkCode=as2&tag=nrjc-21&linkId=425855d5890466e47189e1c21b67a1ea ''Auxins, pages 170-3, GCSE Biology, Hodder, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945954/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945954&linkCode=as2&tag=nrjc-21&linkId=100574c08fbbb64318256eb79ed61a76 ''Auxins, pages 236, 237, 239, 240, GCSE Biology, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945563/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945563&linkCode=as2&tag=nrjc-21&linkId=9a1d023a374038e6072f33c4f3cf808b ''Auxins, pages 81, 82, GCSE Biology; The Revision Guide, CGP, AQA '']
====Edexcel====
:[https://www.amazon.co.uk/gp/product/1292120207/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120207&linkCode=as2&tag=nrjc-21&linkId=22455ff53961978667722edaa64c0be5 ''Auxins, page 136, GCSE Biology, Pearson, Edexcel '']
:[https://www.amazon.co.uk/gp/product/1782948120/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948120&linkCode=as2&tag=nrjc-21&linkId=dedef775c6a43dbb0a609441525adac0 ''Auxins, pages 215-218, GCSE Biology, CGP, Edexcel '']
:[https://www.amazon.co.uk/gp/product/1782946748/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946748&linkCode=as2&tag=nrjc-21&linkId=a4f0348fc37d0ba1bb52d27f8679581f ''Auxins, pages 74, 75, GCSE Biology; The Revision Guide, CGP, Edexcel '']
====OCR====
:[https://www.amazon.co.uk/gp/product/0198359810/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359810&linkCode=as2&tag=nrjc-21&linkId=d768d99f1a06f7c12fab40e5aef85a55 ''Auxins, pages 110-113, Gateway GCSE Biology, Oxford, OCR '']
:[https://www.amazon.co.uk/gp/product/1782945660/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945660&linkCode=as2&tag=nrjc-21&linkId=83aa4500ad7759e7f401a1c5ba5df758 ''Auxins, pages 50, 51, Gateway GCSE Biology; The Revision Guide, CGP, OCR '']