Exam Discussion

[InsaneMcFries]

Yeah that one was right.

I just reckon because of the split they don't have much choice but to allow both right if the explanations are logical.

[bertiebotts]

Hi everyone
Okay so I've read all of your comments (and became progressively more depressed with each new page haha), but I have some queries...

Okay, first off, with the question about what is moving into the bloodsteam - mast cells, phagocytes or natural killers...phagocytes would have been moving in right? Because natural killers only destroy virus cells, and it was a bacteria...thoughts on this?

Now onto the short answer, the very last page, you know the question about 50% of CO2 being prevented by the Chlorella farming (or something like that). I said that it was absorbed via photosynthesis, etc. Is that somewhat correct? Actually, now that I read the stem of the question again, Chlorella uses more CO2 than land plants. Would my answer still be correct if I didn't mention this?!

And for the question below this, it asked for two conditions other than CO2 supply which would affect. Now the stem of the question (which I didn't realise) stated that they do not require prime soil,reliable rainfall or a particular climate. I stated that these two variables would be light intensity, and access to water (I didn't state rainfall). I think that the light intensity one would be correct (possibly?) because I didn't state temperature? But what do you think about the access to water one?

You guys are awesome - and regardless of whether you mucked up some questions, we all did our best wooo!

[InsaneMcFries]

Yeah, they would act as phagocytes. I'm not really sure and confident about the other two.

Guys, I'm curious about the question about what you would look for to determine a plant and animal cell. I made a comparative statement about plant cells having a cell wall whereas animals cells do not. Would the second mark be the comparative statement or a second variable? I only excluded chloroplasts because some plant cells do not have chloroplasts, so therefore you couldn't assume a cell without chloroplasts is an animal cell.

[Panicmode]

Yeah, they would act as phagocytes. I'm not really sure and confident about the other two.

Guys, I'm curious about the question about what you would look for to determine a plant and animal cell. I made a comparative statement about plant cells having a cell wall whereas animals cells do not. Would the second mark be the comparative statement or a second variable? I only excluded chloroplasts because some plant cells do not have chloroplasts, so therefore you couldn't assume a cell without chloroplasts is an animal cell.

I saw two marks so two points. The wording was key. I wrote, "Presence of chloroplasts. If chloroplasts are present then the cell is plant and not animal. Presence of cell wall. If a cell wall is present the cell is not animal." Notice how I don't say that if a cell doesn't have chloroplasts it is animal? Also notice how I did say that presence of the cell wall meant the cell was plant (as bacteria have a cell wall). They might give 1 mark for organelle, 1 mark for explanation however.

[bertiebotts]

InsaneMcFries...I DID THE EXACT SAME THING ABOUT THE CELL WALL! I thought yep, cell wall, but hmmm chloroplasts aren't there necessarily because they're not in potato cells (which are plant cells). Thus, I didn't include chloroplasts, didn't even think of a vacuole. Just praying that a mark for name, and a mark for explanation!

[InsaneMcFries]

Hmm, I'm just interested because it says to determine whether a cell is from an animal OR a plant. This implies to me that it wants knowledge of what feature would determine which of the two it is.

[Scooby]

I didn't even notice the question was worth two marks....