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Its the 3rd layer of the skin:
Epidermis - on the top, renews constantly
Dermis - middle layer, doesnt really renew, this is what is damaged when you get scars, and what tattoo ink is injected into
Hypodermis (not hyperdermis) - is the subcutenous layer of fat under both of these.
There is no hyperdermis in the integumentary system.
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∙ 9y ago
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What are the differences between monocotyledonous and dicotyledonous root system?
Primary vascular bundles in dicot root are generally less than six whereas in monocot root it is generally more than six. Secondary growth does not take place in monocot roots; in dicot roots it is invariably takes place.
Differences between monocot and dicot stem?
Monocot Root* Presence of thin walled cells in the epiblema. * Absence of cuticle and stomata.* Presence of unicellular root hairs.* Presence of passage cells and casparian thickenings in the endodermis.* Presence of parenchyma cells in the pericycle.* Presence of conjuctive tissue.* Presence of a distinct pith.* Presence of radial vascular bundles with polyarch condition and an exarch xylemDicot Root* Presence of thin walled cells in the epiblema. * Absence of cuticle, and stomata.* Presence of unicellular root hairs.* Absence of hypodermis.* Presence of passage cells and casparian thickenings in the endodermis.* Presence of uniseriate pericycle made up of parenchyma.* Presence of conjuctive tissue.* Absence of pith.* Presence of radial vascular bundles exhibiting tetrach condition with exarch xylemDicot Stem Anatomy:1. In dicot stem the epidermal multicellular stem hairs are present.2. Hypodermis present or absent; if present it is collenchymatous.3. Cortex is well differentiated.4. Endodermis and pericycle layers are present.4. Vascular bundles are arranged in a ring, they are conjoint, collateral, open and endarch.6. Pith is distinct and centrally located.Monocot Stem Anatomy:1. Usually stem hair are absent.2. Hypodermic generally present and it is sclerenchymatous.3. No cortex, the entire tissue below hyperdermis is ground tissue.4. No endodermis of pericylce.5. Vascular bundles are scattered in the ground tissue. they are conjoint, collateral and closed.6. Pith is not differentiated. (S_A)
