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CIE IGCSE Biology Alternative to Practical

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It said like it was in the figure above, surely, you can't label something that you haven't drawn, it just doesn't happen.

Reply 101

examhater44

Original post by CIEBioloysifh

It wouldn't mean just label an empty section, you probably needed to drawn the outline of the xylem vessel as it said identify on your diagram I think.

You had to label the section only, drawing of individual xylem cells will be penalised

Reply 102

examhater44

Original post by CIEBioloysifh

Maybe 2 or 3?

Why did u make the edges so jagged

Reply 103

CIEBioloysifh

I drew the outline of the xylem vessel, if you just pointed it to a place in the vascular bundle surely you would lose the mark because you are not pointing anywhere.

Reply 104

CIEBioloysifh

Original post by examhater44

Why did u make the edges so jagged

True, they were curved and have in bits and out bits; but weren't jagged.

Reply 105

juannypacquiao

Was I correct in assuming that for the "red dye" question you had to place a plant in a beaker filled with the solution? Not just cut a piece then stain it?

Reply 106

123Master321

Original post by juannypacquiao

Was I correct in assuming that for the "red dye" question you had to place a plant in a beaker filled with the solution? Not just cut a piece then stain it?

It said it could be seen with a microscope so I assumed you had to prepare the microscope and could cut a piece and stain it??

Reply 107

juannypacquiao

Original post by 123Master321

It said it could be seen with a microscope so I assumed you had to prepare the microscope and could cut a piece and stain it??

I initially placed the plant in the solution so it would rise up the xylem then I would cut it and place it under the microscope. Is that still correct? :s-smilie:

Reply 108

123Master321

Original post by juannypacquiao

I initially placed the plant in the solution so it would rise up the xylem then I would cut it and place it under the microscope. Is that still correct? :s-smilie:

I think this method is fine, but surely you can still dye it after cutting?

Reply 109

Zx12r1

Original post by juannypacquiao

Was I correct in assuming that for the "red dye" question you had to place a plant in a beaker filled with the solution? Not just cut a piece then stain it?

Yep so you put it in the red dye (eosin) solution for 1-2 days then cut stem and place under microscope red bit is xylem bit next to it that isnt coloured is phloem

Reply 110

CIEBioloysifh

If you cut and then dye, the dye is just going to come out..

Reply 111

kelly99

When we get our results in August, do we get infividual paper marks or just a final percentage and grade of the 3 papers of each science?

Reply 112

juannypacquiao

Perhaps the cutting then dying will still be accepted but the max marks available may be lower. Just my thoughts...?

Reply 113

123Master321

Original post by CIEBioloysifh

If you cut and then dye, the dye is just going to come out..

Why is this

Reply 114

123Master321

Original post by juannypacquiao

Perhaps the cutting then dying will still be accepted but the max marks available may be lower. Just my thoughts...?

That's not really how the mark schemes work..

Reply 115

Zx12r1

Original post by 123Master321

Why is this

If you look in the textbook with this practical you have to let the xylem become stained with the red dye and the only way this can be achieved is by putting it in a pot of red dye solution and leaving for 1-2 days there's no other way

Reply 116

juannypacquiao

Original post by 123Master321

That's not really how the mark schemes work..

There have been times in markschemes where it says "A [insert answer here]" but then it says "[MAX 2]" or something even when the question is out of 4 so you can't get all the marks for it