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Homosporous and Heterosporous plants.....help! + generations

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Homosporous and Heterosporous plants.....help! + generations

Postby unrealfighter » Wed Nov 01, 2006 9:20 am

Hi guys. If anyone knows the answers to these questions I would greatly appreciate if he/she posts. Thanks :)

Q1: Are all Bryophytes homosporous?
Q2: Are ferns all homosporous?
Q3: In Magnoliophyta (flowering plants), which structures are the microsporangium, megasporangium, the microgametophyte and the megagametophyte?

Thanks alot guys. These plants in A level are not one of my favorite topics hehe
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Postby SU_reptile » Wed Nov 01, 2006 8:43 pm

Ans. 1. Yes, all bryophytes are homosporous
Ans. 2. Selaginellopsida, Isoetopsida, Marsileidae and Salvinidae are heterosporous. Equisetales are homosporous however sexually are different.
Ans. 3. Microsporangium = pollen sac, microgametophyte = pollen grain, mega(macro-)sporangium = nucellus, macrogametophyte = embryo sac
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Postby unrealfighter » Wed Nov 01, 2006 10:39 pm

Thanks alot...That cleared up most of my difficulties. One more question: So some Polypodiophytes are homosporous, while some others are heterosporous, right?
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Postby SU_reptile » Thu Nov 02, 2006 1:44 pm

Yes, Marsileidae and Salvinidae are water ferns that has spores differentiated into micro- and macrospore. They have also very interesting sporangia-bearing creations (sporocarpia). Try to find some more sophisticated info about them, because they are really worth it.
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Postby unrealfighter » Thu Nov 02, 2006 2:55 pm

Thank you very much. The lecturer today actually mentioned today that when the pollen grain has only 1 nucleus, it is a microspore, but when this nucleus seperates into the tube nucleus and male generative nucleus, it is the microgametophyte. Neat stuff. Hehe Thanks :)
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Postby SU_reptile » Thu Nov 02, 2006 11:34 pm

Glad you're content :)
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