What is Pteridophyte Telome?

telome theory The theory that the leaves (megaphylls) of ferns and seed plants evolved by the modification of terminal branches (telomes) of stems. It envisages that firstly, instead of the primitive equal (dichotomous) branching of the stem, there developed a main axis with lateral side branches.

What is Telome explain the Telome theory?

: a theory in botany : the entire plant body can be interpreted in terms of telomes whether single, with or without sporangia, or variously modified (as in being fused to serve as leaves or other organs)

Who gave Telome theory?

palaeobotanist Walter Zimmermann
The Telome Theory was 1st proposed by the German palaeobotanist Walter Zimmermann in his1930 book entitled “Die Phylogenic de Pflanzen.

What is Telome and Mesome?

•Telome: “The single-nerved ultimate terminal. portion (at base or apex) of a dichotomising axis”. •Mesome: The connecting axes between.

What are the merits of the telome theory?

Merits of the Telome Theory • It is outcome 0f a master mind that has portrayed , in a skilful manner the origin and evolution of the saprophytes of land plants. • Many of his assumptions are correct and based on exact phyletic relationships between the varions groups of plants both living and extinct.

Why was the Pteridophyte originally a leafy plant?

Further, some of the fossils of early pteridophytes were quite complex and not simple strobiloid plants as Bower liked them to be. According to this theory the sporophyte was originally leafy i.e., the fundamen­tal part of the plant body was a leaf and not the axis (stem).

How is the telome theory used in Psilopsida?

1. Psilopsida: The telome theory can be applied to interpret the evolution of a synangium of Psilotum. The overtopping, reduction and syn­genesis have combined to produce a synangium of Psilotum (Fig. 7.139A-D).

What is the difference between sterile and fertile telomes?

Functionally, telomes are of two types viz., fertile telome and sterile telome. If the ultimate branch is terminated by a sporangium then it is a fertile telome (Fig. 7.134), whereas those terminal branches without sporangia are called sterile (vegetative) telomes (Fig. 7.134).