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Plant growth, hormones and tropisms.  Auxins are produced in the tips of shoots and stems, and migrate through the plant elongating the plant.

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Presentation on theme: "Plant growth, hormones and tropisms.  Auxins are produced in the tips of shoots and stems, and migrate through the plant elongating the plant."— Presentation transcript:

1 Plant growth, hormones and tropisms

2  Auxins are produced in the tips of shoots and stems, and migrate through the plant elongating the plant.

3 Plant growth, hormones and tropisms  Auxins are produced in the tips of shoots and stems, and migrate through the plant elongating the plant.  Dicotyledonous angiosperms grow at the tips of their roots and shoots.

4 Plant growth, hormones and tropisms  Auxins are produced in the tips of shoots and stems, and migrate through the plant elongating the plant.  Dicotyledonous angiosperms grow at the tips of their roots and shoots.  Meristem cells – found in growing regions and are the cells capable of mitosis.

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6 Plant growth, hormones and tropisms  Auxins are produced in the tips of shoots and stems, and migrate through the plant elongating the plant.  Dicotyledonous angiosperms grow at the tips of their roots and shoots.  Meristem cells – found in growing regions and are the cells capable of mitosis.  The newly made cells elongate and gain vacuoles – this causes rapid growth seen in the young root or shoot.

7 Plant growth, hormones and tropisms  Auxins are produced in the tips of shoots and stems, and migrate through the plant elongating the plant.  Dicotyledonous angiosperms grow at the tips of their roots and shoots.  Meristem cells – found in growing regions and are the cells capable of mitosis.  The newly made cells elongate and gain vacuoles – this causes rapid growth seen in the young root or shoot.  Specialisation then occurs as the cells differentiate to form tissues such as xylem (for water and mineral transport) phloem (glucose transport)…

8 Plant growth, hormones and tropisms  Auxins are produced in the tips of shoots and stems, and migrate through the plant elongating the plant.  Dicotyledonous angiosperms grow at the tips of their roots and shoots.  Meristem cells – found in growing regions and are the cells capable of mitosis.  The newly made cells elongate and gain vacuoles – this causes rapid growth seen in the young root or shoot.  Specialisation then occurs as the cells differentiate to form tissues such as xylem (for water and mineral transport) phloem (glucose transport)…  Fibres (support), parenchyma (packing and storage).

9 Plant growth, hormones and tropisms  Auxins are produced in the tips of shoots and stems, and migrate through the plant elongating the plant.  Dicotyledonous angiosperms grow at the tips of their roots and shoots.  Meristem cells – found in growing regions and are the cells capable of mitosis.  The newly made cells elongate and gain vacuoles – this causes rapid growth seen in the young root or shoot.  Specialisation then occurs as the cells differentiate to form tissues such as xylem (for water and mineral transport) phloem (glucose transport)…  Fibres (support), parenchyma (packing and storage).  In roots, the epidermal cells make root hairs that absorb water and minerals.

10 Plant growth, hormones and tropisms  Side branches come off the main stem and leaves develop for photosynthesis.

11 Plant growth, hormones and tropisms  Side branches come off the main stem and leaves develop for photosynthesis.  The stem and root may thicken due to cell division in the cambium tissue followed by cell differentiation.

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13 Plant growth, hormones and tropisms  Side branches come off the main stem and leaves develop for photosynthesis.  The stem and root may thicken due to cell division in the cambium tissue followed by cell differentiation.  The mature plant will form flowers for reproduction; after fertilisation, fruit containing seeds form.

14 Plant growth, hormones and tropisms  Side branches come off the main stem and leaves develop for photosynthesis.  The stem and root may thicken due to cell division in the cambium tissue followed by cell differentiation.  The mature plant will form flowers for reproduction; after fertilisation, fruit containing seeds form.  The seeds are then dispersed and continue the life cycle. **Watch in own time** https://www.youtube.com/watch?v=0UEpq1W9C_E

15 Plant growth, hormones and tropisms  Abscission – process of leaf/fruit fall.

16 Plant growth, hormones and tropisms  Abscission – process of leaf/fruit fall.  Layers of dead and hard cells at the base of the stalk form so the plant is protected from water loss/entry of pathogens when the leaf/fruit falls.

17 Plant growth, hormones and tropisms  Abscission – process of leaf/fruit fall.  Layers of dead and hard cells at the base of the stalk form so the plant is protected from water loss/entry of pathogens when the leaf/fruit falls.  Deciduous trees drop all their leaves preventing excess water loss – before the leaves fall, most nutrients and pigments are reabsorbed into the tree.


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