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Coordination in plants

Coordination in plants. Response of plants to the stimulus is much slower and usually respond to stimulus movement of growth. This sort of response is called a TROPISM. - phototropism - geotropism . Phototropism – respons to light.

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Coordination in plants

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  1. Coordination in plants

  2. Response of plants to the stimulus is much slower and usually respond to stimulus movement of growth. This sort of response is called a TROPISM. - phototropism - geotropism

  3. Phototropism – respons to light. - positive phototropism- the shoot grows towards the light. Geotropism – respons to gravity. - negative geotropism – shoots tend to grow away from pull of gravity. - positive geotropism – roots tend to grow towards the pull of gravity.

  4. Why is it important for plants to root and stem behave in this way? Which part of a shoot is sensitive to light? Which part of a shoot responds to light?

  5. The part of a shoot sensitive to light is the tip. • The part of the shoot which responds to the stimulus is the part just below the tip. • These two parts of the shoot must be communicating with one another by means hormones. • Plant hormones are chemical that affect the activites of particular cells. • They may move in the phloem (by diffusion or active transport from cell to cell).

  6. Auxin • Made all the time by the cells in the tip of the shoot • Diffuses downwards from the tip • Make the cells just behind the tip get longer (stimulates cell elongation).

  7. Plant hormones are used in food production • Weedkillers – contain plant hormones (a type of auxin). Selective Weedkillers – kill weeds in lawns or in cereal crops. • Plant hormones are used to help the fruits to grow larger or to ripen well.

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