AQA Biology B2 - Unofficial Mark Scheme

Guys i wrote the wrong experiment for the 6 marker on b2, but i wrote all about keeping it a fair test like keeping it at same intervals and using same beaker , how many marks?

same, i said measure the growth of the plant after moving the light but nothing about bubbles

same. I didnt read the q . Im so scared now. Lost my a*

↑↑↑ In the poll above, an answer like '> 30%' would mean between '30%' and '40%' ↑↑↑


Remember a question? Post your answers below.a)
i) Anaerobic means respiration without oxygen
ii) The athlete was running for 1.5 minutes.
b) How do you know it was anaerobic respiration?
The athlete produced lactic acid
c) How does the flow of the blood help the athlete's muscles?
Removes lactic acid, build up. Causes less fatigue. Supplies oxygen.Question 2 notes: The answer could be any experiment to test how the amount of light intensity affects photosynthesis. The question stated that you did not have to write about the equipment pictured and it was just an example.Circle Cytoplasm. (1 mark)
What is an enzyme? (2 marks)
An enzyme is a substance produced by a living organism which acts as a catalyst to bring about a specific biochemical reaction.Rest of question is incompleteTo improve their investigation: Use random sampling, take more samples.
With the mean average question, people seemed to be getting either 10,100 or 160,000. Different answers I know but we are not sure which is right.

Rest of question is incomplete Stem cells are undifferentiated stem cells that can potentially become any cell.
Rest of question is incomplete
This question had a lot of parts to do with alleles but it was so long no one can really remember it.

I am not sure if the following answer was on the polydactyly question but here are our redicted answers:
Parents genotype: Genotype: mother: Bb father :Bb
Parents phenotype: Both have brown hair
Gametes: Mother: XY Father: XX
Offspring genotype: Brother: bb Sister: Bb
Offspring phenotype: Brother - red hair sister - brown hair

How do you know the man is heterogeneous?
He has B & b alleles.These weren't the only ones but they're the ones I have seen posted the most.

Rest of question is incompleteThe sperm cells were produced in the testes/testicles by Meiosis. The embryo divided by Mitosis.
For the question about the size of each cell:Rest of question is incompleteHow can scientists prove the foxes originated from the same species?
The scientists could breed 2 of the foxes and see if they produce fertile offspring. (Offspring which can reproduce)
How are the foxes different species?
Foxes, Geographical isolation. Adapted differently. Mutation, So unable to breed. Different species.
Why were the foxes on the 3 islands varied but still the same species?
The islands have similar conditions so the two species adapted similarly and were so similar they could still interbreed so were still of the same species.Know more answers? Please message me on twitter @NacoRBLX, thanks!


Note: The questions may not be in the right order.

This is a mix of my answers and those of the community but they are not guaranteed to be correct.