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Revision Notes for Full Course Biology Animal Tissues
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Animal Tissues Notes Full Course Biology
Learning Objectives
Shoot Apical Meristem
Histogen Theory
Histogen theory is proposed by Hanstein (1868) and supported by Strassburgur. The shoot apex comprises three distinct zones.
1. Dermatogen: It is a outermost layer.It gives rise to epidermis.
2. Periblem: It is a middle layer. It gives rise to cortex.
3. Plerome: It is innermost layer. It gives rise to stele
Tunica Corpus Theory
Tunica corpus theory is proposed by
A. Schmidt (1924).
Two zones of tissues are found in apical meristem.
1. The tunica: It is the peripheral zone of shoot apex, that forms epidermis.
2. The corpus: It is the inner zone of shoot apex,that forms cortex and stele of shoot.
Root Apical Meristem
Root apex is present opposite to the shoot apex. The roots contain root cap at their apices and the apical meristem is present below the root cap. The different theories proposed to explain root apical meristem organization is given below.
Apical Cell Theory
Apical cell theory is proposed by Nageli. The single apical cell or apical initial composes the root meristem. The apical initial is tetrahedral in shape and produces root cap from one side. The remaining three sides produce epidermis, cortex and vascular tissues. It is found in vascular cryptogams.
Histogen Theory
Histogen theory is proposed by Hanstein (1868) and supported by Strassburgur.The histogen theory as appilied to the root apical meristem speaks of four histogen in the meristem. They are respectively
i. Dermatogen: It is a outermost layer. It gives rise to root epidermis.
ii. Periblem: It is a middle layer. It gives rise to cortex.
iii. Plerome: It is innermost layer. It gives rise to stele
iv. Calyptrogen: It gives rise to root cap.
Korper kappe theory is proposed by Schuepp. There are two zones in root apex – Korper and Kappe
1. Korper zone forms the body.
2. Kappe zone forms the cap. This theory is equivalent to tunica corpus theory of shoot apex.The two divisions are distinguished by the type of T (also called Y divisions). Korper is characterised by inverted T divisions and kappe by straight T divisions.
Quiescent Centre Concept
Quiescent centre concept was proposed by Clowes (1961) to explain root apical meristem activity. These centre is located between root cap and differentiating cells of the roots. The apparently inactive region of cells in root promeristem is called quiescent centre. It is the site of hormone synthesis and also the ultimate source of all meristematic cells of the meristem
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NEET Full Course Biology Animal Tissues Notes
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Animal Tissues NEET Full Course Biology Notes
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Notes for NEET Biology Full Course Animal Tissues
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