Plant growth, hormones and tropisms

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

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.

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.

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.

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)…

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).

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.

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

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.

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.

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**

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

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.

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.