IGCSE Edexcel Biology - Paper 1

I think you forgot the one about the heart, and how if it doesn't get enough oxygen, it can cause a heart attack

I thought denaturing was just enzymes though? idk it destroys them either way
Isn't there usually a weird experiment question? We were taught to use CORMS. Change Organism Repeat Same

It's the last part of question 9 on my list.

Okay, please correct me if I'm wrong but this what questions came up on today's paper:
1) draw lines to match the boxes (MRS GREN and explanations). 5 marks.
2) Picture of a rat's internal organs.
-> What is an organ ? (1 mark)
-> What is the organ on the diagram that is part of the circulatory system (1 mark)
-> Name two organ systems on the diagram ( 2 marks)
-> Name one other organ system (1 mark)
b) Write the name of the organ for each of the following functions
Ventilation [ ]
Secretion of insulin []
Secretion of HCL []
Secretion of bile []
4 marks
3) Collie eye problem genetics question
-> The phenotype of row hh hh hh hh. 1 mark
-> Row S does not have poor visioned offspring which are the other rows? 1 mark
-> Which row has a 50% chance of producing poor visioned offspring ? 1 mark
-> Which is the genotype of row Hh Hh Hh Hh? 1 mark
(probably some question hear I cannot remember)
4)Explain how smoking damages the lungs. 5 marks.
5)Suggest a reason how carbon monoxide can lead to a smaller baby (4 marks)
6)Phosphates can pollute rivers. Secchi disks can be used to see how polluted. Heres a table
Lake A some relatively high number
Lake B probably a relatively high number
Lake C lowest number
Lake D similar number to C

conclusion C is the most polluted

Two reasons why conclusion could be wrong (2 marks)
b) explain how fish can die as a consequence of phosphates. 5 marks
7) Growth hormone's effect on milk volume.
Bar chart of control, incrementing milligrams of hormone
-> How much hormone should you put for the control? 1 mark
-> Describe the effect of growth hormone. 2 marks
-> This is done for groups of cows, suggest two control variables. 2 marks
b) explain how bacteria can be genetically modified to produce growth hormone. 4 marks
8) Seechi question continued... Graph of different months with a scientist measuring seechi depth for each month
-> how many times did he check the secchi depth? 1 mark
-> he concluded only april was dangerous for swimming, suggest a reason why. 1 mark
-> Suggest a reason why he is incorrect 1 mark
9) Graph question
-> draw a bar chart of the table. 6 marks.
-> describe how data differs for men and women. 2 marks.
-> suggest why. 1 mark.
-> explain the effect of reducing blood supply to the heart. 4 marks.
10) Yield of plants question. Table with 3 fertilisers, nitrates, phosphates, potassium, all 3 percent yield
-> which one has the greatest effect? 1 mark
-> explain why. 2 marks.
-> which one did potassium have the last effect on? 1 mark
-> upland and wetland crop are different, why? 1 mark
b) Dry mass part
-> why is DRY mass needed? 1 mark
-> how do you determine the dry mass of 10kg of potato tubers? 2 marks
-> Why percentage? 2 mark
c) calculation. 12 is the total mass. 5 is some other mass. calculate percentage yield. show your working. 2 marks
11) Design an investigation to see the effect of garlic on mosquito attraction. 6 marks
Yes I know there are 12 questions, I must have one out. Please correct me if I am wrong.

My bad, what is the answer to that question btw?

You forgot the part where they asked why percentage is more effective than using g per km^2 (or what ever the unit was.)

I think my answer was an overkill but I thought I might as well write it down.

Reducing blood supply to the heart muscles, decreases the amount of oxygen and glucose supplied. This decreases aerobic respiration which means less energy is released. Furthermore, anaerobic respiration occurs which produces the toxic compound lactic acid. Oxygen is needed to oxidise the lactic acid. Moreover, less C02 is transferred away so it builds up and causes the pH to lower, preventing enzymes from working. The muscles stop working and a heart attack occurs.

Last part to question 10 b.

Sorry! But I got the question you missed out:
They gave a structure of the inside of the leaf and asked to describe how Layers A, B and C, and structure D help in photosynthesis.

For the oviducts question, I wrote about the woman losing her menstruation cycle and how it can cause other problems related to health and such.
What did you all write for the last question with the mosquito bite-experiment?
and bloody Hell at the Secchi disk question. Feeling uneasy about the thought of it!

Okay I have updated it. I should really find a better way to update it without spamming the thread.

Can we try and get a complete-ish list of questions for the paper with a rough estimate of marks? this is what I remember.

1. the matching question (6 marks)
2. the mouse question (7ish marks)
3.
4.
5.
6.
7.
8.
9.
10.
11.
12. the experimental design question (6 marks)

also, what did you put for the question on where ventilation occurs?

Was D a guard cell or stomata... I wrote both in a sneaky and blurred way what do you think ill get?

Okay, please correct me if I'm wrong but this what questions came up on today's paper:
1) draw lines to match the boxes (MRS GREN and explanations). 5 marks.
2) Picture of a rat's internal organs.
-> What is an organ ? (1 mark)
-> What is the organ on the diagram that is part of the circulatory system (1 mark)
-> Name two organ systems on the diagram ( 2 marks)
-> Name one other organ system (1 mark)
b) Write the name of the organ for each of the following functions
Ventilation [ ]
Secretion of insulin []
Secretion of HCL []
Secretion of bile []
4 marks
3) Collie eye problem genetics question
-> The phenotype of row hh hh hh hh. 1 mark
-> Row S does not have poor visioned offspring which are the other rows? 1 mark
-> Which row has a 50% chance of producing poor visioned offspring ? 1 mark
-> Which is the genotype of row Hh Hh Hh Hh? 1 mark
(probably some question hear I cannot remember)
4)Explain how smoking damages the lungs. 5 marks.
5)Suggest a reason how carbon monoxide can lead to a smaller baby (4 marks)
6)Phosphates can pollute rivers. Secchi disks can be used to see how polluted. Heres a table
Lake A some relatively high number
Lake B probably a relatively high number
Lake C lowest number
Lake D similar number to C

conclusion C is the most polluted

Two reasons why conclusion could be wrong (2 marks)
b) explain how fish can die as a consequence of phosphates. 5 marks
7) Growth hormone's effect on milk volume.
Bar chart of control, incrementing milligrams of hormone
-> How much hormone should you put for the control? 1 mark
-> Describe the effect of growth hormone. 2 marks
-> This is done for groups of cows, suggest two control variables. 2 marks
b) explain how bacteria can be genetically modified to produce growth hormone. 4 marks
8) Seechi question continued... Graph of different months with a scientist measuring seechi depth for each month
-> how many times did he check the secchi depth? 1 mark
-> he concluded only april was dangerous for swimming, suggest a reason why. 1 mark
-> Suggest a reason why he is incorrect 1 mark
9) Graph question
-> draw a bar chart of the table. 6 marks.
-> describe how data differs for men and women. 2 marks.
-> suggest why. 1 mark.
-> explain the effect of reducing blood supply to the heart. 4 marks.
10) Yield of plants question. Table with 3 fertilisers, nitrates, phosphates, potassium, all 3 percent yield
-> which one has the greatest effect? 1 mark
-> explain why. 2 marks.
-> which one did potassium have the last effect on? 1 mark
-> upland and wetland crop are different, why? 1 mark
b) Dry mass part
-> why is DRY mass needed? 1 mark
-> how do you determine the dry mass of 10kg of potato tubers? 2 marks
-> Why percentage? 2 mark
c) calculation. 12 is the total mass. 5 is some other mass. calculate percentage yield. show your working. 2 marks
11) Design an investigation to see the effect of garlic on mosquito attraction. 6 marks
Yes I know there are 12 questions, I must have one out. Please correct me if I am wrong.