Dicot Stem Vs Monocot Stem
Anatomical Similarities and Different Between Dicot Stem and Monocot Stem
(I). Similarities between dicot stem and monocot stem:
Ø Epidermis is usually single layered in both dicots and monocots
Ø Thick layer of cuticle present in both groups
Ø Hypodermis is present in both the group (cell type varies)
Ø Photosynthetic chlorenchymatous zone is present in the cortex of both dicots and monocots
Ø Major portions of ground tissue is parenchymatous
Ø Xylem and phloem are organized as vascular bundles in dicots and monocots
Ø Vascular bundles are conjoint and collateral in both the groups
Ø In monocots and dicots xylem and phloem composed of both proto- (protoxylem and protophloem) and meta- elements (metaxylem and metaphloem)
(II). Difference between Dicot Stem and Monocot Stem
Sl. No. Dicot Stem Monocot Stem
1 Multicellular epidermal hairs usually present over the epidermis Epidermal hairs are absent
2 No silica deposition over the epidermis Usually silica deposition occurs over the epidermis
3 Hypodermis collenchymatous Hypodermis sclerenchymatous
4 Ground tissue is differentiated into stelar and extra-stelar tissues Ground tissue not differentiated into stelar and extra-stelar tissues
5 Endodermis present Endodermis absent
6 Vascular bundles are limited in numbers, usually 4 to 8 Vascular bundles numerous
7 Vascular bundles are arranged in the form of one or two broken ring(s) Vascular bundles are arranged scattered in the ground tissue
8 Vascular bundles are conjoint, collateral and open Vascular bundles conjoint, collateral and closed
9 Many protoxylem and metaxylem elements present in each vascular bundle Only two metaxylem elements in each vascular bundles
10 Xylem elements are polygonal Xylem elements are circular
11 Protoxylem lacuna absent Protoxylum lacuna present
12 Vascular bundles with sclerenchymatous bundle cap Bundle cap absent
13 Bundle sheath absent around the vascular bundles Vascular bundles are surrounded by sclerenchymatous bundle sheath
14 Pericycle present Pericycle absent
15 Phloem parenchyma and phloem fibres present Phloem parenchyma and phloem fibres absent
16 Pith usually present Pith usually absent
17 Medullary rays present Medullary rays absent
18 Undergo secondary thickening No secondary thickening
Fig 1
Fig 2
Fig. 3
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