The male and female reproductive organs of several pteridophytes and gymnosperms are comparable to floral structures of angiosperms. Make an attempt to compare the various reproductive parts of pteridophytes and gymnosperms with reproductive structures of angiosperms.
Answers
Answer:
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Explanation:
1) Sporophylls- Leaf or leaf part associated with sporangia from sporophyll in some pteridophytes, all gymnosperms and angiosperms.
2) Differentiation of Sporophylls- Only a few pteridophytes have differentiation of Sporophylls into microsporophylls and megasporophylls. The differentiation is complete in gymnosperms and angiosperms.
3) Microsporophylls - It bears a single microsporangium in pteridophytes, two or several microsporangia in gymnosperms and four microsporangia in angiosperms.
4) Megasporophyll - A single megasporangium is associated with a megasporophyll in pteridophytes, two to a few integumented megasporangia or ovules in angiosperms.
5) Aggregation of Sporophylls- Sporophylls are aggregated to form strobili in pteridophytes and gymnosperms. They form flowers in angiosperms.
6) Microspore - It produces a male gametophyte with several motile male gamates in pteridophytes, only two motile or nonmotile male in gymnosperms and two non motile male gametes in angiosperm.
7) Megaspore- It forms female gametophyte with many archegonia in pteridophytes and gymnosperms, but only one reduced female sex organ, consisting of one oosphere and two synergids in angiosperms.
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