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 [...]
In this essay we will discuss about the life cycle of Pinus, explained with the help of suitable diagrams. Sporophyte of Pinus: Pinus is a tall evergreen tree giving rise to a series of widespread horizontal branches (Fig. 1.57A). In each year, a whorl of branches is produced in the axil of scale leaves. The branching is restricted to the [...]