OCR Biology B1 B2 B3 16th May 2017 ANSWERS

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Becca2000

For the food chain calculation percentage I think I put 0.2%, for the Caucasians I put I think 12% and for the Hispanics I got 20% so 400 people.

I am fairly sure that these match my answers too.😀

Which board is this?

Original post by DD2508

What did everyone say for the ocean pH question?

Carbon dioxide decreases the pH. The greater the decrease, the more CO2. The more CO2, the faster the rate of global warming as CO2 is a greenhouse gas

Reply 23

humayun.h

Isn't that exam on the 24th? :s-smilie:

Reply 24

humayun.h

Is this OCR 21st century?

OCR gateway?

Original post by Becca2000

I am fairly sure that these match my answers too.😀

I added two numbers for the Caucasion one.... I'm getting stressed now.

Reply 27

alwaysconfused:

Original post by danielwinstanley

I added two numbers for the Caucasion one.... I'm getting stressed now.

So did I... 12 + 5 = 17%

Reply 28

username1986099

Original post by alwaysconfused:

So did I... 12 + 5 = 17%

I think I did that! I added the last two white bars. Hoping it's right

Reply 29

Zimlof

Original post by matthewparker34

I said pH could rise due to acidic gases such as sulfur dioxide, which comes from coal buring power stations, which release greenhouse gases, which cause the greenhouse effect and therefore global warming. Why I didn't just talk about CO2 I will never know.

Thats what I wrote too... do you think its a possible correct answer???

Reply 30

Hamza.anwar321

It's actually 17% for the caucasians

Reply 31

tanisha04

Original post by danielwinstanley

I think I did that! I added the last two white bars. Hoping it's right

I did this too and by adding 12 and 5 but then i realised this was too easy so i added all the white bars which added up to 100. Then i did 100\100 which gives you 1% and then multiplied by 17 which gave 17%. So either way i got 17% don't know how people got 12% though.

Reply 32

GCSEm

Original post by DD2508

What did everyone say for the ocean pH question?

I think the answer to this was in the question - at the top around the phytoplankton description there was a statement that carbon dioxide dissolved in water caused a decrease in ocean pH. Therefore a low pH in water would indicate a high level of carbon dioxide, which is a greenhouse gas and contributes to the greenhouse effect due to the correlation between increase of CO2 and temperature.

Reply 33

Daydreamer3

Original post by danielwinstanley

I wrote water vapour is a greenhouse gas so more water vapour means increased greenhouse effect. This means more water to react with sulfur and nitrogen dioxide to produce acid rain. This decreases pH of the water.

Probably horrifically wrong, but it seemed logical in the exam.

In the question it said that carbon dioxide decreases the pH of water so I think you had to explain how if the pH is low so its strongly acidic then that means the water is very polluted with carbon dioxide increasing the rate of the greenhouse effect. But idk....

Reply 34

Reiss Murphy

What was the answers to the tickbox about how Phytoplankton remove CO2 in the sea?

Reply 35

username1986099

Original post by Daydreamer3

I didn't have time to fully read though - I was rushing so I scanned it. Technically, I might get like 1/3 for it so all good.

Reply 36

Daydreamer3

Original post by danielwinstanley

I think I did that! I added the last two white bars. Hoping it's right

The question asked how many not the percentage. And if you added the bars to get you get 13%+7% which is 20 and then you found 20% of 2000 so the answer was 400.

Reply 37

tanisha04

Original post by Daydreamer3

The question asked how many not the percentage. And if you added the bars to get you get 13%+7% which is 20 and then you found 20% of 2000 so the answer was 400.