Internal structure of stem

By: Ivan Jeremy V. Guerrero

 Stems are surrounded by a transparent epidermis that is usually one cell thick and often bears trichomes. Trichomes of tomato plant secrete an irritating juice that deters hungry insects, while hooked-shaped trichomes often entangle insects and prevent them from feeding while they struggle to free themselves.

 Vascular bundles are often enclosed by or associated with schlerenchyma fibers that differentiate after the internode has finished elongating.

 Vascular bundles are as follows: monocots have vascular bundles embedded s throughout in the ground tissue. Dicots have vascular bundles embedded in a single ring in ground tissue. Gymnosperms and some dicots have concentric cylindrical vascular bundles: the phloem surrounds the xylem.

 Between the epidermis and the vascular tissue is the cortex. Most cortical cells are parenchyma; also, some are photosynthetic. In dicots, parenchymatous ground tissue in the center of the stem is called the pith. These pith are lignified & specified for storage.

 Monocot vascular tissue are found throughout the stem, so ground tissue in monocots are not discernable as pith or cortex. Parenchyma in monocots are simply called ground tissue.

Internal structure of stem

by Janielle Sabio on Jan 26, 2012

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