Pin by Biology 4u on Simple Biology Videos Plant life cycle
What Is Heterospory. Web heterospory is a phenomenon in which two kinds of spores are borne by the same plant. 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;
Pin by Biology 4u on Simple Biology Videos Plant life cycle
Heterospory evolved during the devonian period from isospory independently in several plant groups: The clubmosses , the ferns including the arborescent. The smaller one is known as microspore and the larger one is known as megaspore. The larger spore is called a megaspore which leads to forming a female gametophyte. 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. Web heterospory is the formation of two morphologically different spores (megaspores and microspores) from the sporophytes of pteridophytes and other seed plants. Microspores and megaspores in a single plant. 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. The smaller spore is known as a microspore which germinates to form a male gametophyte.
The larger spore is called a megaspore which leads to forming a female gametophyte. Examples of heterospory plants are selaginella, salvinia, and marsilea, etc. 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. It is defined as the production of two spores that are different in size in the same plant. The smaller of these, the microspore , is male and the larger megaspore is female. The clubmosses , the ferns including the arborescent. 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. These spores differ in size. Web heterospory is a type of spore formation in plants that occurs when the plant’s sporophyte produces two different kinds of spores.
