Question

✔Write down all the features of a dicot stem.

Ex: it's epidermis, Hypidermis, Cortex etc (min 6points)


✔Write down the features of a mknocot stem.
Also write it's features.

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Answer 1

Answer:

FEATURES OF DICOT STEM

• Presence of well-defined epidermis with cuticle and multicellular stem hairs.

• Cortex has collenchymatous hypodermis regularly or as discontinuous patches.

• Endodermis is distinct as the innermost layer of the cortex.

• Pericycle composed of parenchyma and sclerenchyma alternately as irregular patches (heterogenous).

• Vascular bundles are conjoint, collateral, endarch, open and arranged in a ring surrounding pith (eustele).

• The center of pith is made from thin walled parenchyma cells with distinct intercellular spaces. Pith rays or medullary rays are found as separator of two vascular bundles.
• FEATURES OF MONOCOT STEM
• Have thick cuticle, single layered epidermis and epidermal hairs are absent
• Single layered cuticularised epidermis may contain multicellular trichomes
• Ground tissues are not differentiated into cortex and pith
• Hypodermis is generally sclerenchymatous
• It has no distinct endodermis and pericycle
• ​Epidermis contains stomata with guard cells.
• Scattered vascular bundles are surrounded by sclerenchymatous bundle sheath cells and called atactostele
• Each vascular bundle is oval, conjoint, collateral and closed

Explanation:

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Answer 2

Presence of well-defined epidermis with cuticle and multicellular stem hairs.
Cortex has collenchymatous hypodermis regularly or as discontinuous patches.
Endodermis is distinct as the innermost layer of the cortex