What Is Heterospory. These spores differ in size. Web heterospory induces a drastic reduction in the sizes of their gametophytes.
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These microspores and megaspores are formed respectively within microsporangia and megasporangia which in turn are borne on two distinct sporophylls called microsporophylls and megasporophylls respectively. The microspore germinates to form the male gametophyte and the megaspore germinates to form the female gametophyte. In heterosporous forms the differentiation of sex can be predicted at the spore stages. The larger spore is called a megaspore which leads to forming a female gametophyte. Web heterospory is a type of spore formation in plants that occurs when the plant’s sporophyte produces two different kinds of spores. The smaller of these, the microspore , is male and the larger megaspore is female. Web heterospory induces a drastic reduction in the sizes of their gametophytes. The megaspores are the bigger spores that produce a female gametophyte and the microspores are the smaller ones that produce a male gametophyte. These spores differ in size. Web heterospory is a phenomenon in which two kinds of spores are borne by the same plant.
The two phases, or generations, are often morphologically,. Petersen & burd, 2016 ). The larger spore is called a megaspore which leads to forming a female gametophyte. Web heterospory induces a drastic reduction in the sizes of their gametophytes. Web heterospory, defined as the production of smaller male microspores and larger female megaspores, arose independently in all major vascular plant lineages (lycophytes, monilophytes and spermatophytes) and is considered a key innovation for terrestrial colonization (bateman & dimichele, 1994; The smaller spore is known as a microspore which germinates to form a male gametophyte. The two phases, or generations, are often morphologically,. These microspores and megaspores are formed respectively within microsporangia and megasporangia which in turn are borne on two distinct sporophylls called microsporophylls and megasporophylls respectively. There is an extreme reduction in the male gametophyte and, in most cases, it is nothing but an antheridium. The megaspores are the bigger spores that produce a female gametophyte and the microspores are the smaller ones that produce a male gametophyte. The clubmosses , the ferns including the arborescent.
