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Question from a freshman-definitions

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Question from a freshman-definitions

Postby Mafer » Sat Oct 07, 2006 2:05 pm

In my country, we just change our Science subject to English, so I had my SPM Science Subject in Malay. Then, when I enter STPM, I have to start all over again.

Here are some of my question:

When I come across Bryophyta Division, I don't know what it mean by the thallus has dichotomous branching. What does it mean?

What is cupules?

In Funaria, what is seta? What is theca, operculum and apophysis?
I'm weird and crazy!
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Postby Poison » Sat Oct 07, 2006 4:41 pm

Cupule: A fruit structure that protects the seed. It can be fully closed or releases the seed when it becomes mature by opening with 4 valves.
Here is the dictionary definition:
http://www.biology-online.org/dictionary/Cupule
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acrocarp2.jpg
Seta is the part that carries sporangium.
Theca: you can think it as spore case.
Operculum: The opening
apophysis: The fertile elements in the sporangium.
acrocarp2.jpg (23.21 KiB) Viewed 6326 times
s_dichotomous.gif
You see every branch grows by dividing into 2. That is called dicotomous branching.
s_dichotomous.gif (1 KiB) Viewed 6324 times
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Postby MrMistery » Sun Oct 08, 2006 4:57 pm

wow neat response ozge. you really worked on it. good job
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Postby Poison » Mon Oct 09, 2006 8:03 pm

You are answering most of the questions so I felt happy when I found myself a playground. :P :lol: Just kidding of course... :D
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Postby Mafer » Tue Oct 10, 2006 8:01 am

Thank you. I find that helpful!
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Postby SU_reptile » Tue Oct 17, 2006 4:38 pm

Hi there. I dare to explain those things with some more details.

Dichotomous branching occurs when the apical meristem divide into two identical parts that grow more less simultanously. In that type no branching is dominating (cotrary to monopodial branching for example). In bryophyta, Marchantia polymorpha is a good example.

Seta is the stem of the sporophyte of a bryophyte and it bears a sporangium. It's long and greenless in Bryopsida and Polytrichopsida. Sphagnopsida don't have seta and the sporangium is carried by a pseudopodium - the short stalk originating in gametophyte.

Operculum - in plants it is the cover of a sporangium. In higher bryophytes it's hidden under calyptra.

Apophysis is a swelling present just beneath the sporangium.

P.S. I am from Poland and, however we have courses in Polish but I want to know biology in English so I need to find all those things too. Regards
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Postby Dr.Stein » Wed Oct 18, 2006 1:31 am

Aha! I like the way Ozge explaining! That's because I am a big fan of figures ;) Good job, my dear :)
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Postby Poison » Thu Oct 19, 2006 8:59 pm

They make answers look more simple even if they are not. :)
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Postby Dr.Stein » Fri Oct 20, 2006 2:45 am

Yes, figures "talks" much more than sentences ;)
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Postby MrMistery » Fri Oct 20, 2006 6:10 pm

"a picture is worth 1000 words"..
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Postby hira4rmpk » Sat Oct 21, 2006 6:54 am

a picture just an expressions without sound
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Postby Dr.Stein » Sun Oct 22, 2006 2:17 am

Suddenly we turn to become a poet :lol:
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