Short notes on anatomy (Internal Structure)

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(a) Stem – The T.S. of stem reveals that the epidermis forms the outermost layer consisting of a single layer of small, thin walled cells.

It contains chloroplasts in young stem, which changes to brown and thick- walled cells lacking chloroplast in older stem.

The epidermis is followed by a multilayered cortex consisting of parenchymatous cells containing chloroplast. Medulla forms the central core of the stem and consists of slightly thick walled, compact, hyaline cells and often lack protoplasm.

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(b) Leaf – Anatomically the leaf is with one celled thick lamina consisting of parenchymatous cells containing chloroplast, except at the midrib region. The mid-rib region consist of 4 – 5 layers of cells, which are thin walled but at the centre there occurs few thick walled cells which function as conducting strands. Leaves are devoid of stomata and vascular bundles.

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