Post by: sum1 on March 16, 2013, 11:51:29 pm
Post by: Stick on March 17, 2013, 11:32:30 am
Post by: sum1 on March 17, 2013, 12:05:42 pm
Post by: Stick on March 17, 2013, 12:44:33 pm
Post by: psyxwar on March 17, 2013, 12:48:13 pm
^ I wouldn't know the answer to that question (I've never even heard of fucoxanthin) so I assume you wouldn't need to know that. If this came up on an assessment and I needed to tackle this question logically, I'd say that fucoxanthin is a pigment that attracts the radiant energy of sunlight more strongly. Sea plants, being underwater, still require sunlight energy for photosynthesis (although I think some sea plants fit in the protozoa category) but obviously this is quite difficult as there is a large body of water between them and the sun.It probably relates to differences in wavelengths of light that they absorb -- it absorbs blue-green and yellow-green wavelengths, meaning that the underwater algae which don't have as much exposure to light as land plants are able to absorb and use more wavelengths of light.
Post by: Stick on March 17, 2013, 12:49:25 pm
Post by: psyxwar on March 17, 2013, 12:50:29 pm
Ah, thanks for the correction. Did you learn this in class, and would you deem it important for the assessments? :)LOL nah I googled the pigments and made an educated guess. I really doubt it'll be on the assessments.
Post by: sum1 on March 17, 2013, 12:53:41 pm
Post by: psyxwar on March 17, 2013, 12:59:29 pm
Would it be right to say that chlorophyll b is the main accessory pigment in land plants because of its broader spectrum hence absorbs a broader wavelength?Yeah I'd think so. The reason why it's the main one as opposed to fucoxanthin is probably because they have plenty of light and therefore weren't pressured to develop more efficient pigments (like the one in the algae that's able to absorb the green wavelengths reflected by chlorophyll a)
Post by: Smiley_ on March 17, 2013, 01:33:55 pm
Yeah I'd think so. The reason why it's the main one as opposed to fucoxanthin is probably because they have plenty of light and therefore weren't pressured to develop more efficient pigments (like the one in the algae that's able to absorb the green wavelengths reflected by chlorophyll a)
what are other people doing for their sacs?
Post by: Bad Student on March 17, 2013, 04:07:48 pm
Post by: psyxwar on March 17, 2013, 06:05:00 pm
Is it necessary to know all this stuff about chlorophyll a, chlorophyll b and fuckoxanthin?I'd think you should definitely learn about chlorophyll a and the general function of accessory pigments, but yeah, I really doubt you need to know about that last one.
Post by: Bad Student on March 17, 2013, 06:08:21 pm
Post by: Stick on March 17, 2013, 06:09:19 pm
Is it necessary to know all this stuff about chlorophyll a, chlorophyll b and fuckoxanthin?
lol
Post by: psyxwar on March 17, 2013, 06:10:30 pm
My photosynthesis SAC is tomorrow and I've never heard of the different types of chlorophyll or accessory pigments!!!If you haven't covered it in class I really doubt they'd cover it in the SAC. Just to be safe though, you might want to do some light reading on the topic.
Post by: Yacoubb on March 17, 2013, 06:24:32 pm
lol
My same reaction Stick!!
Post by: Snorlax on March 20, 2013, 06:33:53 pm
Why are chlorophyll found in the Thylakoid membrane?
Post by: DylanBurrowes on March 20, 2013, 08:44:40 pm
Post by: Yacoubb on March 20, 2013, 08:47:00 pm
Post by: Smiley_ on March 22, 2013, 09:16:17 pm
Post by: Stick on March 22, 2013, 10:09:16 pm
Post by: Yacoubb on March 23, 2013, 08:42:42 am
Post by: peterpan101 on March 24, 2013, 03:19:03 pm
Post by: AbominableMowman on March 24, 2013, 03:43:09 pm
Why does increasing bubble rate suggest an increasing rate of photosynthesis?If there is an increasing rate of photosynthesis then there will be an increasing rate of release of oxygen by the plant, which causes the bubbles to form.
Post by: Smiley_ on March 24, 2013, 03:49:16 pm
If there is an increasing rate of photosynthesis then there will be an increasing rate of release of oxygen by the plant, which causes the bubbles to form.
edit:whoops dont worry
Post by: Conic on March 24, 2013, 03:57:11 pm
Post by: AbominableMowman on March 24, 2013, 04:55:32 pm
edit:whoops dont worryI was gonna write CO2 as well then I realised it was oxygen LOL.
Post by: Smiley_ on March 24, 2013, 05:17:43 pm
I was gonna write CO2 as well then I realised it was oxygen LOL.
i know you automatically think co2 bubbles !
Post by: Snorlax on March 27, 2013, 11:41:47 am
Could someone explain the question as i'm so lost on how the answer comes to that conclusion.
http://www.vcaa.vic.edu.au/Documents/exams/biology/2009biol1-w.pdf
http://www.vcaa.vic.edu.au/Documents/exams/biology/biology_assessrep_june09.pdf
In addition, Question 17 of the MC, on the 2010 mid year exam.
How are we suppose to know that?!
http://www.vcaa.vic.edu.au/Documents/exams/biology/2010biol1-w.pdf
http://www.vcaa.vic.edu.au/Documents/exams/biology/biology1_assessrep_10.pdf
Post by: psyxwar on March 27, 2013, 12:16:30 pm
Has anyone seen Question 3, d) (short answer), on the 2009 mid year exam?For the first one: as we can see from the loss of pigment in the leaves over the autumn months, the leaves are changing in colour. Only trees that lose their leaves in winter exhibit a color change (to a orangish brownish color) in Autumn - the alternative are evergreen trees which are green all year long. Therefore, we can conclude that the leaves of the tree in question belong to a tree that loses its leaves in winter.
Could someone explain the question as i'm so lost on how the answer comes to that conclusion.
http://www.vcaa.vic.edu.au/Documents/exams/biology/2009biol1-w.pdf
http://www.vcaa.vic.edu.au/Documents/exams/biology/biology_assessrep_june09.pdf
In addition, Question 17 of the MC, on the 2010 mid year exam.
How are we suppose to know that?!
http://www.vcaa.vic.edu.au/Documents/exams/biology/2010biol1-w.pdf
http://www.vcaa.vic.edu.au/Documents/exams/biology/biology1_assessrep_10.pdf
Post by: kerry.j on March 27, 2013, 07:19:52 pm
Has anyone seen Question 3, d) (short answer), on the 2009 mid year exam?
Could someone explain the question as i'm so lost on how the answer comes to that conclusion.
http://www.vcaa.vic.edu.au/Documents/exams/biology/2009biol1-w.pdf
http://www.vcaa.vic.edu.au/Documents/exams/biology/biology_assessrep_june09.pdf
In addition, Question 17 of the MC, on the 2010 mid year exam.
How are we suppose to know that?!
http://www.vcaa.vic.edu.au/Documents/exams/biology/2010biol1-w.pdf
http://www.vcaa.vic.edu.au/Documents/exams/biology/biology1_assessrep_10.pdf
For the second one, I think students are often taught that red and blue light are most effective for photosynthesis. Between red and blue, some sources say that red light allows for slightly more effective photosynthesis than blue light. However, it would really depend on the plant and the pigments it contains, wouldn't it?
Post by: hardworker on March 27, 2013, 09:21:35 pm
Post by: Yacoubb on March 28, 2013, 11:42:04 pm
doesn anyone know what product from photosynthesis allows plants to survive in cold environments(arctic).
Well anti-freeze substances in plants lower the freeIng point of the fluid found in cells, in cold arctic climates. So it would have to be an anti-freeze substance?!