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May 12, 2026, 09:19:47 am
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Author Topic: SAC #3  (Read 1930 times)  Share 

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Milkshake

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SAC #3
« on: April 24, 2010, 07:55:13 pm »
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So i just finished my 3rd biology SAC :D! But there was this one question on it that i wasn't quite sure of.

Sorry, forgot to add. It was just a few plant cells placed on agar, plenty of nutrients and everything available.
« Last Edit: April 26, 2010, 10:05:54 pm by Milkshake »
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happyhappyland

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Re: SAC #3
« Reply #1 on: April 24, 2010, 08:13:15 pm »
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Im not too sure either, thats quite a hard question.. our bio sacs are really easy and hardly relate to any vcaa questions >.<. Im guessing that there isnt even cytokinin or auxin for the root to grow, or the environment is not in the ideal conditions; water availablity etc.
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lexitu

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Re: SAC #3
« Reply #2 on: April 25, 2010, 02:02:15 pm »
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What a shit and unreasonable question to ask. Grr. Anyway this might help.

"High levels of cytokinin combined with low levels of auxin results in growth of shoots."

"... a relatively high level of of auxin and a relatively low level of cytokinin... results in formation of roots."

The first statement agrees with what happened, the second doesn't though. This is bullcrap, it's not for our level of biology and it doesn't even agree with the textbook. Anyway, if you want to read more, try p.158 of Nature of Biology.
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Milkshake

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Re: SAC #3
« Reply #3 on: April 29, 2010, 07:47:05 pm »
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ahhhk, thanks anyway.

new question, do plant cells REQUIRE auxin/cytokinin for them to grow? or can they still make-do without a source of auxin/cytokinin
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happyhappyland

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Re: SAC #3
« Reply #4 on: April 29, 2010, 07:53:28 pm »
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Quote from: Milkshake on April 29, 2010, 07:47:05 pm
ahhhk, thanks anyway.

new question, do plant cells REQUIRE auxin/cytokinin for them to grow? or can they still make-do without a source of auxin/cytokinin

They do, Auxin causes cells to produce a protein that sustains the growth of cells. Cytokinins promote cell division. Technically, I think they can "grow" for a certain amount without auxin and cytokinin. Gibberellin is always required because it is to do with seed germination.
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Milkshake

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Re: SAC #3
« Reply #5 on: April 29, 2010, 07:56:47 pm »
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Quote from: happyhappyland on April 29, 2010, 07:53:28 pm
Quote from: Milkshake on April 29, 2010, 07:47:05 pm
ahhhk, thanks anyway.

new question, do plant cells REQUIRE auxin/cytokinin for them to grow? or can they still make-do without a source of auxin/cytokinin

They do, Auxin causes cells to produce a protein that sustains the growth of cells. Cytokinins promote cell division. Technically, I think they can "grow" for a certain amount without auxin and cytokinin. Gibberellin is always required because it is to do with seed germination.

hmm, so do you think that i should state that the plant immersed in water-only will not experience ANY growth at all?
« Last Edit: April 29, 2010, 08:10:39 pm by Milkshake »
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