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  • That the shoot apical meristem has layered structure giving rise to different tissues was given byOption: 1 Tunica Corpus theory<div cl

That the shoot apical meristem has layered structure giving rise to different tissues was given by

Option: 1

Tunica Corpus theory


Option: 2

Histogen theory


Option: 3

Korper Kappe theory


Option: 4

Apical Cell theory


Answers (1)

best_answer
 

 

Shoot Apex and the Theories related to Shoot Apex

  • Shoot apex is derived from the meristem present in plumule of the embryo.
  • It is present at the tip of the stem.
  • The axillary bud represents the left behind cells of the shoot apical meristem. It is present in the axil of the leaves.
  • Shoot apex is dome-shaped and the base of the meristem divides to form flanks of leaf primordia.

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. 
 

Types of Shoot Apex:

1. Monoplex Type: In this type of shoot apex, there is only a single apical cell that represents the shoot apical meristem. It is seen in higher algae, bryophytes and pteridophytes.

2. Simplex Type: In this type of shoot apex, there is a single layer of meristematic cells that represent the shoot apical meristem. It is seen in gymnosperms.

3. Duplex Type: In this type of shoot apex, there are multiple layers of meristematic cells that represent the shoot apical meristem. It is seen in angiosperms.
 

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That the shoot apical meristem has layered structure giving rise to different tissues was given by Histogen theory.

Posted by

manish painkra

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