Photosynthesis prac

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linotas
Posts: 659
Joined: 21 Mar 2011, 22:39
State/Location: TAS

Photosynthesis prac

Post by linotas »

Does anyone do the photosynthesis prac where you cut out disks of ivy, degas and place in bicarb solution?

How long before hand can the leaf disks be prepared? I have 4 classes starting P1 Monday to prepare 15 groups of 40 each class! I am wanting to at least get a head start but I am assuming they need to be fresh. Any info to the contrary would be greatly appreciated.
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ELIZABETH
Posts: 233
Joined: 02 Jun 2006, 10:00
School: O'Connor Catholic College
Suburb: Armidale
State/Location: NSW

Re: Photosynthesis prac

Post by ELIZABETH »

Yes, they need to be ultra fresh....we do this and it works really well (not in the numbers you're talking, however!).
Maybe dragoon some helpers?
Cheers
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Debbie
Posts: 44
Joined: 15 May 2006, 10:00
State/Location: QLD

Re: Photosynthesis prac

Post by Debbie »

This prac sounds interesting - would it be possible to get a copy of it please? Many thanks
linotas
Posts: 659
Joined: 21 Mar 2011, 22:39
State/Location: TAS

Re: Photosynthesis prac

Post by linotas »

It's essentially this:

https://docs.google.com/document/d/1f0V ... t?hl=en_US

but we don't use the soap and use old overhead projectors as the light source
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Debbie
Posts: 44
Joined: 15 May 2006, 10:00
State/Location: QLD

Re: Photosynthesis prac

Post by Debbie »

I can not access this link. Is there another site to look at or a document someone could share/email me? Thanks
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bindibadgi
Posts: 293
Joined: 13 May 2009, 09:37
Suburb: Kensington Park
State/Location: SA

Re: Photosynthesis prac

Post by bindibadgi »

We do this prac every year, & yep I do go a bit insane sitting for ages punching discs!
Another Adelaide labbie once said that he punches them the day before, & puts them in distilled water in the fridge. In the morning they're all sunk & ready to use. It works quite well, & I just put the flask on the vacuum pump for a little while to sink the few that are still floating.
Our prac sheet is attached.
Photosynthesis prac method.docx
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bindibadgi
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Milo
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Joined: 31 Mar 2014, 10:16
State/Location: ACT

Re: Photosynthesis prac

Post by Milo »

We just have one Year 11 Biology class doing this, and they punch the leaf holes out themselves. That might not be feasible depending on the age group and numbers, I suppose. We use spinach or silverbeet leaves.
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Debbie
Posts: 44
Joined: 15 May 2006, 10:00
State/Location: QLD

Re: Photosynthesis prac

Post by Debbie »

Thanks so much guys - my daughter was looking for something for her biol investigation so she might give this a try. Have a great weekend
linotas
Posts: 659
Joined: 21 Mar 2011, 22:39
State/Location: TAS

Re: Photosynthesis prac

Post by linotas »

Milo wrote:We just have one Year 11 Biology class doing this, and they punch the leaf holes out themselves. That might not be feasible depending on the age group and numbers, I suppose. We use spinach or silverbeet leaves.
Usually they would but this is an prac test so time is limited and they want them pre cut. As it is I think I am going to have put them in distilled water and bicarb solution as I cut as 3 classes are spread over Monday and one on Tuesday. I also have prac tests for phy sci on the same day at the same time in different buildings so I can't be everywhere at once.
michellen
Posts: 15
Joined: 04 May 2017, 12:27
State/Location: QLD

Re: Photosynthesis prac

Post by michellen »

Hi! Has anyone tried using elodea leaves instead of spinach leaf discs for this prac? I was wondering if it would work as well, and save me time punching discs.
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