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A-Level Biology OCR A

Shoots Roots Cell Elongation Light Phototropic Iaa Inhibits

Shoots are positively phototropic (grow towards light), and roots are negatively phototropic (grow away from light), because IAA promotes cell elongation in shoots but inhibits it in roots.

Les pousses sont phototropiquement positives (poussent vers la lumière) et les racines sont phototropiquement négatives (poussent à l'opposé de la lumière), car l'IAA favorise l'élongation des cellules des pousses mais inhibe celle des racines.

Front Describe and explain the phototropic responses in shoots and roots.
Back Phototropism in shoots and roots:
  • Shoots - positively phototropic, roots - negatively phototropic
  • This is because IAA inhibits cell elongation in roots & promotes it in shoots
  • In both,, IAA moves away from light source:
    • In roots, it inhibits cell elongation on the unilluminated side, causing growth away from light
    • In shoots, it promotes cell elongation on unillumnated side, causing growth towards light

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