plant hormones

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5 Terms

1
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what is a tropism?

  • a plant’s growth response to directional stimuli

  • directional and can be +ve/-ve

2
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give 3 examples of stimuli a plant may respond to:

  • light

  • gravity

  • water

3
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what are tropisms regulated by? give an example:

  • specific growth factors

  • IAA (indoleacetic acid)

4
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explain tropisms in plant shoots:

  • root tips produce IAA, which can diffuse to other cells to promote cell elongation

  • in directional light, IAA diffuses to the shaded side of the shoot

  • a higher IAA conc causes the shaded side to elongate more

  • this causes the plant to bend towards the light source - +ve phototropism

<ul><li><p>root tips produce IAA, which can diffuse to other cells to promote cell elongation </p></li><li><p>in directional light, IAA diffuses to the shaded side of the shoot</p></li><li><p>a higher IAA conc causes the shaded side to elongate more</p></li><li><p>this causes the plant to bend towards the light source - +ve phototropism</p></li></ul><p></p>
5
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explain tropisms in plant roots:

  • in plant roots, IAA inhibits cell elongation

  • IAA is produced in root tips and diffuses to the lower side of the root

  • this means that the lower side elongates less than the upper side

  • this causes the root to bend towards gravity and away from light - +ve gravitropism and -ve phototropism (respectively)

<ul><li><p>in plant roots, IAA inhibits cell elongation</p></li><li><p>IAA is produced in root tips and diffuses to the lower side of the root</p></li><li><p>this means that the lower side elongates less than the upper side</p></li><li><p>this causes the root to bend towards gravity and away from light - +ve gravitropism and -ve phototropism (respectively)</p></li></ul><p></p>