Archive | Botany

Telome Theory (With Diagram)

Introduction to Telome Theory: It is now widely accepted (on the basis of overwhelming amount of evidence) that the land- dwelling plants evolved from aquatic ancestors. Ail organisms known in the Precambrian, Cambrian and Ordovician periods of Paleozoic Era lived in aquatic environment. The evolution­ary conquest of land probably occurred some­times between the late Cambrian and early Silurian. The concrete [...]

By |2016-08-24T10:16:51+00:00August 24, 2016|Botany|Comments Off on Telome Theory (With Diagram)

Structure of Lycopodium (With Diagram) | Pteridophyta

In this article we will discuss about the structure of Lycopodium with the help of diagrams. The main plant body is sporophytic. It con­sists of slender and branched stem, numerous small leaves (microphylls) and dichotomously- branched roots (Fig. 7.23A, B). Roots: The primary root or first formed root of the young sporophyte is ephemeral, short-lived. The older plants have dichotomously [...]

By |2016-08-24T10:16:51+00:00August 24, 2016|Pteridophyta|Comments Off on Structure of Lycopodium (With Diagram) | Pteridophyta

Heterospory: History, Origin and Advantages

In this article we will discuss about:- 1. History of Heterospory 2. Incipience of Heterospory 3. Origin 4. Evidences 5. Advantages. History of Heterospory: Pteridophytes are the first true land plants. Being the first successful colonisers in land habit pteridophytes show both the homospory and heterospory. Most of the pteridophytes are homo­sporous, produce isospores which are morpholog­ically and physiologically identical. [...]

By |2016-08-24T10:16:51+00:00August 24, 2016|Pteridophyta|Comments Off on Heterospory: History, Origin and Advantages
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