Phototropism in shoots occurs as uneven auxin distribution causes shaded side cells to elongate more, bending the shoot towards light; in roots, auxin accumulates at the bottom, inhibiting elongation and directing growth downwards.
In shoots, uneven auxin distribution caused by light makes the shaded side elongate more, bending the shoot towards light. In roots, auxin moves to the bottom, inhibiting elongation and causing downward growth.
| Front | Auxins response to light (phototrophism) In shoots: In roots: |
|---|---|
| Back | Shoots: 1-More light reaches one side of a shoot2-More auxin is sent down the shaded side of the shoot 3-Resulting in cells in the shaded regionelongating more 4-Therefore the shoot grows towards the light. Roots: In roots auxin moves to the bottom of the root and causes less elongation therefore root grows downwards. |
Learn with these flashcards. Click next, previous, or up to navigate to more flashcards for this subject.
Next card: Roots auxins response gravity geotropism moves side facing
Previous card: Growth phototrophic roots shoots away/negatively towards/positively bends light
Up to card list: Biology - ecology by Will Eastwood.