The clubmosses , the ferns including the arborescent. Petersen & burd, 2016 ). The two phases, or generations, are often morphologically,. Web heterospory is the production of spores of two different sizes and sexes by the sporophytes of land plants. Web heterospory induces a drastic reduction in the sizes of their gametophytes. It is defined as the production of two spores that are different in size in the same plant. The smaller one is known as microspore and the larger one is known as megaspore. The microspore germinates to form the male gametophyte and the megaspore germinates to form the female gametophyte. Web heterospory is a phenomenon in which two kinds of spores are borne by the same plant. The female gametophyte never outgrows the limits of the megaspore.
The smaller of these, the microspore , is male and the larger megaspore is female. Web heterospory is a type of spore formation in plants that occurs when the plant’s sporophyte produces two different kinds of spores. These spores differ in size. Petersen & burd, 2016 ). Web alternation of generations, also called metagenesis or heterogenesis, in biology, the alternation of a sexual phase and an asexual phase in the life cycle of an organism. The heterosporous condition has been observed in many families of flowering plants, including the grasses and sedges and some conifers. The female gametophyte never outgrows the limits of the megaspore. Heterospory evolved during the devonian period from isospory independently in several plant groups: The smaller one is known as microspore and the larger one is known as megaspore. The microspore germinates to form the male gametophyte and the megaspore germinates to form the female gametophyte. The megaspores are the bigger spores that produce a female gametophyte and the microspores are the smaller ones that produce a male gametophyte.
