a)Differentiate the following Monocot root and Dicot root b) Draw a neat labelled diagram of Radial vascular bundle
Answers
a)
Dicot root
*The cortex area is narrow.
*The epiblema, cortex and endodermis are peeled and replaced by cork.
*Older dicot roots have a covering of cork.
*The endodermis is less thick and the Casparian strips are prominent.
*Passage cells are absent in the endodermis.
*Percicycle produces cork cambium and lateral roots.
*The number of xylem and phloem bundles vary from 2-5 and sometimes up to 8.
*Xylems vessels are angular
*The conjunctive tissue is parenchymatous and it forms the cambium.
*Secondary growth takes place to help cork and vascular cambium.
*Pith is reduced or absent and the reduced pith is very small.
Monocot root
*The cortex region is wide.
*There is no formation of cork and only the epiblema is peeled off.
*Older monocot roots show a covering of exodermis.
*Endodermis cells are highly thick and the Casparian stripes are only visible in young roots.
*Passage cells are present and they are thin-walled.
*Pericycle only produces lateral roots.
*The number of xylem and phloem cells range between 8-46.
*Xylem vessels are oval or rounded.
*The conjunctive tissue can be parenchymatous or sclerenchymatous and conjunctive parenchyma does not form the cambium.
*Secondary growth is absent.
*Pith is well-developed.
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