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29topic_10_f07 - Topic 10 Topic 10 Stems Stems Monocot...

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Unformatted text preview: Topic 10 Topic 10 Stems Stems Monocot Anatomy What are monocots? They are the Monocotyledones , one of the two classes of angiosperms that are generally all herbaceous and include plants such as the lilies, palms, rushes, orchids, grasses and bamboo . Monocot Anatomy What are monocots? The monocots as a general rule do not produce secondary growth although some members appear woody. The vascular bundles are closed. Monocot Stem Closed Vascular Bundle Green outline indicates ring of lignified bundle Green outline indicates ring of lignified bundle sheath cells sheath cells Monocot Anatomy Vascular Arrangement Vascular bundles scattered. A monocot stem cross section showing scattered vascular bundles. Monocot Anatomy Vascular Arrangement Ground tissue surrounds vascular bundles and is not usually separated into pith and cortex. Monocot Anatomy Vascular Arrangement In some monocots, particularly the grasses and rushes, a hollow stem results from a pith that degenerates. Monocot Anatomy Vascular Arrangement Subepidermal sclerenchyma, thick walled parenchyma and bundle sheath sclerenchyma provide rigidity of the stem. A view of a monocot, bulrush (Scirpus sp.) aerial stem. The patches of subepidermal fiber strands helps provide strengthening for support. Note the dispersed distribution of vascular bundles typical of monocot stems. Monocot Anatomy Woody Bamboo Appears woody and is incredibly strong. Bamboo is extensively used in construction world wide. The use of bamboo for scaffolding on construction projects in China. Some high-rise buildings are built using bamboo scaffolding . A house in Asia built with bamboo. Monocot Anatomy Woody Bamboo Its strength is due to bundle sheath fibers and lignified ground parenchyma. lignified parenchyma lignified parenchyma bundles of fibers bundles of fibers Monocot Anatomy Woody Bamboo It is light and flexible due to the hollow stems and septa at the nodes. Bamboo poles waiting for use in construction projects Bamboo poles waiting for use in construction projects Dicot Primary Growth Vascular Bundles Their general development is similar to that of the monocots. Dicot Primary Growth Vascular Bundles The bundle sheath sclerenchyma is only to the outside of the phloem which makes them open bundles. Dicot Primary Growth...
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29topic_10_f07 - Topic 10 Topic 10 Stems Stems Monocot...

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