The following points highlight the three classes of Pteridophytes. The classes are: 1. Psilopsida 2. Lycopsida 3. Sphenopsida. Pteridophytes: Class # 1. Psilopsida (Psilophytes): They are the most primitive vascular plants. Roots are absent. Instead rhizoids occur. Stem is dichotomously branched. It has two parts, aerial and rhizomatous. Aerial stems are green and photosynthetic. Leaves may be present or absent. [...]
In this article we will discuss about:- 1. Characters of Vascular Plants 2. Reasons for Dominance and Success of Vascular Plants. Characters of Vascular Plants: 1. They are those plants which possess conducting or vascular tissues, xylem and phloem. Xylem transports water and minerals while phloem conducts organic food. 2. Vascular plants comprise more than 275,000 living species. 3. They [...]
In this article we will discuss about the Characters and Economic Importance of Pteridophytes. Characters of Pteridophytes: They are characterised by the following features: 1. Plant body is a sporophyte (2n) and differentiated into true stem, leaves and roots. 2. Leaves can be microphyllous (small without forming leaf gaps in vascular supply of stem, e.g., Selaginella) or macrophyllous (megaphyllous or [...]