In this article we will discuss about the origin of seed in selaginella. An evolutionary sequence of origin of seed from homosporous form should involve: (a) Production of two kinds of spores, (b) Reduction in the number of functional megaspores, (c) Final reduction to a single megaspore in the sporangium, (d) Retention of megaspore within the megasporangium, (e) Elaboration of [...]
In this article we will discuss about the process of reproduction in selaginella with the help of diagram. Selaginella is heterosporous. Two types of sporangia (larger ones megasporangia and smaller ones microsporangia) containing larger and smaller spores are borne on sporophylls which form cones terminally either on the stem or branches. The cones are inconspicuous due to small size and [...]
Here is a compilation of essays on 'Pteridophytes' for class 8, 9, 10, 11 and 12. Find paragraphs, long and short essays on 'Pteridophytes' especially written for school and college students. Essay on Pteridophytes Essay Contents: Essay on the Introduction to Pteridophytes Essay on the Origin and Success of Land Plants Essay on the Classification of Pteridophytes Essay on the [...]