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- #Structural Organisation in Animals and Plants
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Who gave Tunica Corpus Theory?
Nageli
Hanstein
Schmid
Grew
Answers (1)
Theories Related to Shoot Apex
1. Apical Cell Theory: It was given by Nageli in 1858. It provides for a single apical meristematic cell at the shoot tip. This theory holds true for higher algae, bryophytes and pteridophytes.
2. Histogen Theory: It was given by Hanstein in 1870. It provides for layers of meristematic cells giving rise to specific sets of tissues as follows:
a) Dermatogen: it forms the epidermal tissue system.
b) Periblem: it forms the cortex.
c) Plerome: it forms the vascular tissues.
3. Tunica Corpus Theory: It was given by Schmidt in 1924. It provides for two distinct zones in the shoot apex as:
a) Tunica: It gives rise to the epidermis. It divides by the anticlinal divisions.
b) Corpus: It is the central core and divides to give volume to the plant body.
Tunica Corpus Theory was given by Schmidt in 1924.
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