Some pteridophytes are heterosporous
WebA pteridophyte is a vascular plant (with xylem and phloem) that disperses spores.Because pteridophytes produce neither flowers nor seeds, they are sometimes referred to as "cryptogams", meaning that their means of … WebJan 23, 2024 · • In some pteridophytes the sporangia develop on stems (i.e., cauline in origin) while in other they are borne either on the leaves ... Marsilea). • The sporophyte plant may be homosporous (e.g., Lycopodium, Dryopteris) or heterosporous (e.g., Selaginella, Isoetes, Marsilea) 9.
Some pteridophytes are heterosporous
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WebApr 2, 2024 · This condition is considered as an evolutionary stage in the development of land plants. The phenomena of heterospory was reported in Pteridophytes for the first time. > Pteridophytes are considered as an intermediate between the primitive and higher plants. Most of them exhibit homospory, but some of them do exhibit heterospory. WebJun 24, 2024 · Do you think heterospory has some evolutionary significance in plant kingdom? Ans: In majority of the pteridophytes all the spores are of similar kinds, such plants are called hom’osporous. Genera like Selaginella, Salvirtia, Marsilea and Azolla which produce two kinds of spores, macro (large) and micro (small) spores are known as …
WebOct 27, 2024 · Characteristics Of Heterosporous Pteridophytes These pteridophytes produce two types of spores (the microspores and megaspores). Spores are generally small … WebConcept-. Plants are divided into five groups- Thallophytes, Bryophytes, Pteridophytes, Gymnosperms and Angiosperms.; Pteridophytes are the first terrestrial plants to acquire vascular tissues – xylem and phloem.; Pteridophytes have two groups- . The majority of the pteridophytes are homosporous i.e., one type of spores formed.; While some …
WebOct 29, 2024 · A heterosporous life history occurs in some pteridophytes and in all seed plants. It is characterized by morphologically dissimilar spores produced from two types … http://www.jnpg.org.in/WebDoc/EContent/science/General%20characters%20of%20Pteridophytes.pdf
WebFor the first time distinct heterospory (structural as well as functional) is evident in pteridophytes; but out of several hundred forms in the group, only 9 genera (Selaginella, Isoetes, Stylites, Marsilea, Pilularia, Regnellidium, Salvinia, Azolla, and Platyzoma) are heterosporous. Heterospory has been of considerable interest because of its ...
WebJun 6, 2013 · some heterosporous ferns and Equisetum. ... microgametophyte – in heterosporous pteridophytes, a male . gametophyte borne within a microsporangium and bearing one or . more antheridia. csh for 使い方cshfredlocalWebAnswer (1 of 2): * * Seed is produced by zygote and surrounding tissues of the ovule. The zygote divides and redivides to produce a pre-formed baby plant called embryo. Thr embryo is encapsulated in the developed ovule tissues with nutritive tissues and the propagule is a 'seed'. * Seed is... eagerly awaiting your replyWebSep 20, 2024 · Some examples of homosporous pteridophytes are clubmoss and puzzlegrass while some examples of heterosporous … csh for文WebAnswer: Homosporous plants have spores of one size which produce bisexual gametophytes. This fern is an example of a homosporous plant Heterosporous plants … eagerly definition antonymWebSome members (e.g., Lycopodium) are homosporous, while some are heterosporous (example., Selaginella). Biflagellate or multiflagellate antherozoids. Germination of spores … eagerly competeshttp://files.differencebetween.com/wp-content/uploads/2024/01/Difference-Between-Homosporous-and-Heterosporous-Pteridophytes.pdf csh foundation