In this essay we will discuss about:- 1. Root of Cordaitales 2. Stem of Cordaitales 3. Leaf 4. Fructification 5. Seed. Essay # 1. Root of Cordaitales: The roots of cordaitales are highly branched and shallow forming stilt roots like those of mangroves. This indicates the halophytic nature of the plants which grew along the sea shores. Anatomically, the root [...]
In this essay we will discuss about the classification of meristems. Essay # 1. Classification on the Basis of Development: Promeristem or Primordial Meristem: It is the very fundamental stage of meristem action. It initiates new organs and tissues, it is also known as embryonic meristem. It comprises the apical initials and their immediate derivatives. As soon as the cells [...]
In this essay we will discuss about:- 1. Stems of Lyginopteris Oldhamia 2. Fronds of Lyginopteris Oldhamia 3. Roots 4. Pollen-Bearing Organs 5. Seeds. Essay # 1. Stems of Lyginopteris Oldhamia: The frequently branched stem of Lyginopteris oldhamia was long, slender (2 mm to 4 cm in diameter). The anatomy of the stem (Fig. 1.2A) shows eustelic configuration with [...]