how many cells are observed in T.S dicot stem
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A common category of a dicot stem is a sunflower.
The outline of the stem in the transverse section is circular with a hairy surface.
The transverse section illustrates the interpretation of various tissues in a specific way from the exterior to the centre as listed below:
- Epidermis: it is the outermost covering of the stem and is single-layered.
- Cortex: located just under the epidermis, it consists of the following regions – Hypodermis, Endodermis, and General cortex.
Steele: it forms the central core possessing a vascular bundle. It contains – the pericycle, vascular bundles, medullary rays, and pith.
(a) Pericycle: located between the vascular bundles and endodermis.
(b) Medullary rays: it is placed in the gaps between the vascular bundles.
(c) Vascular bundle: They are open, collateral and conjoint and are set up in a ring-like manner.
Each of the vascular bundles comprises- the xylem, phloem, and cambium.
- Phloem: located below the pericycle towards the external side. It contains thin cell walls containing companion cells, a sieve tube and phloem parenchyma and conducts food material.
- Xylem: established in the interior of the vascular bundle, i.e., smaller protoxylem towards the centre and larger metaxylem towards the periphery. Then xylem is endarch. Xylem conducts minerals and water.
- The cambium is existing between phloem and xylem. The cells are rectangular and possess thin cell walls. It contains meristematic tissues that produce new cells.
(d) Pith: It constructs the mid-region of the stem. It originates under the vascular bundle up to the centre and consists of huge parenchymatous cells.
