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What is heterospory? Give two examples.

Question asked by: Zara

Zara24

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Ebenezer G

Heterospory is the production of spores of two different sizes and sexes by the sporophytes of land plants. The smaller of these, the microspore, is male and the larger megaspore is female. Heterospory evolved during the Devonian period from isospory independently in several plant groups: the clubmosses, the arborescent horsetails,[1] and progymnosperms.[1][2] This occurred as part of the process of evolution of the timing of sex differentiation.

eg:Male and Female cone of pine [Pinophyta]

Emily approved October 13, 2017
0
anuj singh

Two different type spore bearing plant as megaspore and microspore eg. pinus

Emily edited answer September 11, 2017
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KASIRAJU KARTHIK SHARMA

HETEROSPORY :- THIS IS A CONDITION IN WHICH AN ORGANISM (PLANTS)PRODUCE TWO DIFFERENT TYPES OF GAMETES (MORPHOLOGICALLY)i.e, ONE LARGE GAMETE AND THE OTHER BEING A SMALL GAMETE OR FLAGELLATED AND NON-FLAGELLATED GAMETES IS KNOWN AS HETEROSPORY.
EXAMPLE:- Selaginella,Salvinia.

Emily approved September 11, 2017
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Suresh N Pathiki

Selaginella, Isoetes, Stylites, Marsilea, Pilularia, Regnellidium, Salvinia, Azolla and Platyzoma are the living examples

Lepidocarpon, Lepidostrobus, Mazocarpon, Plaeuromeia, Sigillariostrobiis (members of Lycopsida), and Calamocarpon, Calamostachys, Palaeostachys (members of Sphenopsoda). are extinct genera and fossils

Emily approved September 11, 2017
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Suresh N Pathiki, Principal (Retired), Anantapur, AP 515001 India

Lepidocarpon, Lepidostrobus, Mazocarpon, Plaeuromeia, Sigillariostrobiis (members of Lycopsida), and Calamocarpon, Calamostachys, Palaeostachys (members of Sphenopsoda). These refer to the fossil genera.
The living members include: Selaginella, Isoetes, Stylites, Marsilea, Pilularia, Regnellidium, Salvinia, Azolla and Platyzoma (9 genera)

Emily approved September 11, 2017
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Shivani

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.

Emily approved September 11, 2017
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