Aqa biology/further additional/ b3 unofficial mark scheme

The one with the disease had a smaller surface area so less oxygen could be exchanged at once, meaning that the person could not respire fast and his cells would lack of oxygen for respiration. Nit sure if thats right, but i put that

What did you guys put down for the questions about farmed cow meat vs cultured?

I put that with the disease, the alveolus has a much smaller surface area to volume ratio, therefore the rate of diffusion of carbon dioxide and oxygen is considerably less. Then I linked it to less oxygen being available for aerobic respiration, which in turn makes it difficult for exercise as less energy can be supplied to muscles for movement.

there was a question about the blood and u had to describe the what each part does, i dont know if it was the first six marker or the second
What was the other one?

Thank you
Do you have an approx prediction of how many marks it will be for an A*?


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There was no six marker on the blood!

- One was on how plant ions, glucose and water get around a plant
- Another one was on how the body regulates your temperature when you are cold

the six marker was about blood - you had to talk about A B and C which were red blood cells, white blood cells and platelets. you had to talk about their structure and stuff

There was no six marker on the blood!

- One was on how plant ions, glucose and water get around a plant
- Another one was on how the body regulates your temperature when you are cold

You mentioned plasma as well?

the easiest biology exam i have ever done!!!!!!
1) osmosis, active transport
A has gained in weight because there was a higher concentration of water(dilute) outside the bag so water entered the bag by osmosis.
B is the one that changes the less because the concentration of sugar outside the bag(4.2) is nearly the same as the concentration of sugar inside the bad(5) so only small amount of water will enter the bag by osmosis and the net movement will then stop.

the six marker was okay I put:
A was red blood cells, they have no nucleus and carry haemoglobin which combines with oxygen to make oxyheamogobin, they carry oxygen from the lung to the cells in the body and then oxyheamoglobin break into oxygen and heamoglobin for exchange
B was white blood cell, produce antibodies to kill pathogens, and antitoxin to neutralise the toxin produced by harmful microorganisms
C was platelets, they help the blood to clot at a wound to stop excessive bleeding and stop microorganism from entering.

last question on mycoprotein
the fungus, fusarium is grown in a fermenter which is supplied with glucose syrup for food and respiration+oxygen for aerobic repirarion +nitrogen for growth and the production of amino acids
air is filltered and sterilised so that unwanted microorganisms dot grow in the fermenter
the fusarium is then harvested,purified and dried so that it can be used in food.

the 2 differences between the composition of blood in the vein and artery are:
veins have deoxygenated blood whereas arteries have oxygenated blood
veins have more carbon dioxide than arteries(because it has just come from the cell and exchanged oxygen for CO2 and are now going to the heart to go to the lungs to get rid of it in the alveoli)

i cant remember the question numbers and other questions so if u remember a question, tell me

It was there

did you do aqa higher tier B3?

the easiest biology exam i have ever done!!!!!!
1) osmosis, active transport



I thought osmosis was only the movement of water not sodium ions🤔Idk maybe im wrong but i wrote diffusion and active transport for that first question

On the B3 AQA higher paper, the six mark questions were to do with plants and body temperature. There was no six mark question on the composition of the blood.

Posted from TSR Mobile
your answer to first the six marker is wrong it was about ions water and sugar no the blood

Good, I nearly **** myself thinking i left a page out