Edexcel GCSE Biology B1 12 May 2015

All those people that explained the process of eutrophication are wrong because it says EXPLAIN THE PROBLEMS WITH NITRATES AND PHOSPHATES.

I thought they caused eutrophication though!

Reply 141

The_Phlox

3

People say it was easy but there will have been a lot of people that made silly mistakes which will cost them much more than 7 marks

Reply 142

maxxyyy

1

Original post by The_Phlox

All those people that explained the process of eutrophication are wrong because it says EXPLAIN THE PROBLEMS WITH NITRATES AND PHOSPHATES.

hunny, nitrates and phosphates cause eutrophication in lakes beacause they cause excessive growth

Reply 143

The_Phlox

3

Original post by kevthestudent

I thought they caused eutrophication though!

They do but you have to state the problems which means that you either state the problems outright or link the steps to the problems they cause e.g: algae grows on the surface and this is a problem because it kills plants that are underneath due to a lack of photosynthesis.

Reply 144

maxxyyy

1

omg, im so stressed. i was aiming for an A* but after reading all these coments im praying for an A

Reply 145

_ariane29

9

Original post by The_Phlox

They do but you have to state the problems which means that you either state the problems outright or link the steps to the problems they cause e.g: algae grows on the surface and this is a problem because it kills plants that are underneath due to a lack of photosynthesis.

Im sure that's just edexcels odd wording. The problems are the steps of eutrophication, its definitely right.

Reply 146

Roadrunner_

Original post by _ariane29

I was so close :frown:

I did the energy of tree - energy of caterpillar/ energy tree could have given, × 100. Do you think I'll get 1 mark?

I'm not entirely sure, unfortunately I don't think you will, it was a 3 mark question, so I'm presuming 1 mark was awarded for correct subtraction, another for recognising to divide by the amount of energy it could've produced or perhaps for "x 100" and then the last for a correct percentage decrease, however that being said there's a possibility that you may get method marks, however I can't be certain.

Reply 147

The_Phlox

3

Original post by _ariane29

Im sure that's just edexcels odd wording. The problems are the steps of eutrophication, its definitely right.

Either way, I wrote about the problems such as organisms dying etc

Reply 148

Katniss1

2

Original post by The_Phlox

All those people that explained the process of eutrophication are wrong because it says EXPLAIN THE PROBLEMS WITH NITRATES AND PHOSPHATES.

So what did you write?

Reply 149

_ariane29

9

Original post by Roadrunner_

I'm not entirely sure, unfortunately I don't think you will, it was a 3 mark question, so I'm presuming 1 mark was awarded for correct subtraction, another for recognising to divide by the amount of energy it could've produced or perhaps for "x 100" and then the last for a correct percentage decrease, however that being said there's a possibility that you may get method marks, however I can't be certain.

Thanks

Probs havent got an a* but I tried :tongue:

Reply 150

Tuned2000

For the 4 mark neuron question did we have to describe how a reflex arc works?

Reply 151

tmckenzie51

I put - Testes don't produce sperm and then some random answer to try and secure the other mark -

Reply 152

Roadrunner_

Original post by Tuned2000

For the 4 mark neuron question did we have to describe how a reflex arc works?

Pretty much

Reply 153

Katniss1

2

Original post by The_Phlox

People say it was easy but there will have been a lot of people that made silly mistakes which will cost them much more than 7 marks

That's me, except I didn't learn how to do the calculations. Overall I think I've lost about 10 marks, hoping for an A* still, what do you think the A* boundary will be?

Reply 154

The_Phlox

3

Original post by Katniss1

So what did you write?

They do but you have to state the problems which means that you either state the problems outright or link the steps to the problems they cause e.g: algae grows on the surface and this is a problem because it kills plants that are underneath due to a lack of photosynthesis.

Reply 155

The_Phlox

3

Original post by Katniss1

That's me, except I didn't learn how to do the calculations. Overall I think I've lost about 10 marks, hoping for an A* still, what do you think the A* boundary will be?

It is the sort of test that you will think you did well, but upon reflection you will lose more marks than you would have ever thought

Reply 156

Katniss1

2

Original post by The_Phlox

They do but you have to state the problems which means that you either state the problems outright or link the steps to the problems they cause e.g: algae grows on the surface and this is a problem because it kills plants that are underneath due to a lack of photosynthesis.

I did that, it's the same thing as eutrophication. How can you sate the problems if it asks you to explain?

Reply 157

alpine1850

4

It was something about the mucus blocking up the sperm ducts or something haha.. basically everybody was confused on that one!

Reply 158

The_Phlox

3

Original post by Katniss1

I did that, it's the same thing as eutrophication. How can you sate the problems if it asks you to explain?[/QU

Either way I still think we are both right.