structure of woody plants

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secondary phloem download (6)

outer bark download (8)

cork and cork cambium

secondary growth in roots

angiosperms and roots of conifers undergoes secondary growth like stems

the wood produced in roots and stem are same

tissue in the stem of a plant that gives rise to cork on its outer surface and a layer of cells containing chlorophyll on its inner surface

inner cell remain cork cambium while outer becomes cork after division

all cells are cuboidal

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phellogen

pith download (5)

procambium download (4)

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interfascicular cambium

fascicular cambium

analogous form of growth download (7)

secondary growth in monocots

roots of sweet potatoes

axial system

radial system run parallel to radii that pass through the center of the axis

secondary xylem download (12)

growth ring download (11)

heartwood and sapwood download (9)

types of wood cells

reaction wood download (10)

axial system

consists of tracheids and trachery elements

consists of fibers

derived from fusiform initials

found on branches

reaction wood in place of normal wood where cambium cell are oriented than vertically

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heartwood is dark while sapwood is light in color

main function of the heartwood is to support the tree

gives water and nutrients from rots to the leaves

during a single growth period ncrement of wood

a concentric layer wood, shell or bone

radial system

derived from ray initials

ray parenchyma cell