Tag: plant tissues - internal morphology and anatomy

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Questions Related to plant tissues - internal morphology and anatomy

Multiple choice botany plant tissues - internal morphology and anatomy theories of meristematic cell development theories of shoot apical meristem development shoot and root apex

Histogen theory was proposed by

  1. Nageli

  2. Schmidt

  3. Hanstein

  4. Wolf
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • The shoot apical meristems located at the shoot tip in plants are derived from the apical meristematic tissues according to the histogen theory given by Hanstein in 1868.
  • It consists of three distinct layers:-
1) Dermatogen is the primary meristem that forms the outer most layer of a plant or a plant part and forms the epidermis.
2) Periblem is a primary meristem which is located between the plerome and the dermatogen and it forms the cortex.
3) Plerome is the primary meristem that forms the central core of a plant or plant part which gives rise to the stele (includes the vascular tissue, pith and pericycle).
  • The part of plerome from which vascular tissues are formed is called procambium.
So, the correct answer is 'Hanstein'
Multiple choice botany plant tissues - internal morphology and anatomy theories of meristematic cell development theories of shoot apical meristem development shoot and root apex

According to the concept of waiting meristem, the active region of shoot apex is?

  1. Anneau initial

  2. Meristeme medullaire

  3. Promeristeme sporogene

  4. Promeristeme receptaculaire
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

According to the waiting meristem concept, the 'anneau initial' (initial ring) is the peripheral zone of the shoot apex that remains active and contributes to leaf and stem formation.