In this article we will discuss about the classification of amphibians. Sub Class (1) Labyrinthodontia (Folded Teeth): 1. The name Labyrinthodontia is derived for the structure of teeth. 2. In a cross-section the teeth shows a complete radiating infoldings of the enamel surface. This type of teeth is also present in rhipidistian crossopterygians. 3. The skull was massive and completely [...]
In this article we will discuss about the classification of birds. 1. Subclass Archaeornithes [Gk. Archios = ancient + ornithos = bird] [1 species, Jurassic, Bavaria]: i) This subclass includes most primitive, fossil birds of Jurassic period and are known from Germany. ii) Wings had primitive feathers. iii) Tail feathers were arranged in a row along each side of a [...]
In this article we will discuss about the classification of various plant movements. 1. Autonomic Movements: These movements are due to internal causes. For instance, the organism and reproductive cells move as a whole from place to place. Some of the common examples are ciliary movements. 2. Ciliary Movements: The cilium is a widely occurring organelle of eukaryotic plant cells. [...]