What is heterospory briefly comment with example?
Answers
Explanation:
The phenomenon of heterospory lead to the reduction of gametophyte, in situ germination of spores, retention of megagametophyte in the megasporangia and finally to the seed development. Examples of heterospory are Selaginella, Salvinia and Marsilea, etc.
Heterospory is a phenomenon in which two kinds of spores are borne by the same plant. These spores differ in size. The smaller one is known as microspore and the larger one is known as megaspore. ... Heterospory is thus considered an important step in evolution as it is a precursor to the seed habit.Heterospory means the formation of two distinctly different spores. The smaller one, designated as microspore later on gives rise to the male gametophyte and the larger one called megaspore gives rise to female gametophyte. Heterospory commonly occurs in all gymnosperms and certain pteridophytes such as Selaginella.
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❤. HETEROSOPHY ❤
⭐. Production of two kinds of spores on the same plant is called "heterosophy" .
Ex : selaginella ,salvinia.
❤. SIGNIFICANCE ❤
⭐. Two types of spores are seen
1. Microspore - germinate into male gametophyte.
2. Megasprore - germinate into female gametophyte.
⭐. Sex organ in male gametophyte is Antheridia. It gived antheroids as male gamets.
⭐. Sex organ in female gametophyte is Archegonia. It produces egg as female gamets.
⭐. Fusion of Antherozoids to egg results zygote.
⭐. Development of zygote into young embryo takes place within the female gametophytes.
⭐. This event is precursor to the seed habitat . This is considered as important step in evaluation.