Saturday, 23 February 2013

2.82 describe positive phototropism of stems

Stems experience positive photo-tropism, this means they always grow towards light.
In a place where light shines there will be fewer auxins (growth hormones) this encourages the stem to bend towards the source of light.

4 comments:

  1. surely if the plant would want more growth hormones

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  2. The plant wants less on that side as of the side which isn't receiving as much light grows faster it then causes the stem to bend (think of it like a corner on a race-track the inside of the corner is a shorter length than the outside of the corner meaning you get a bend)

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  3. The Biology Syllabus has changed.... New Syllabus Blog:

    http://igcse-biology-2017.blogspot.hk

    ReplyDelete
  4. more at

    http://igcse-biology-notes.blogspot.hk/2017/06/282-describe-positive-phototropism-of.html

    ReplyDelete