Exam (elaborations)
AQA AS BIOLOGY Paper 2 JUNE 2024 MARK SCHEME
- Course
- Institution
This is the final mark scheme
[Show more]
Content preview
A levelAQA
AS
BIOLOGY
7401/2
Paper 2
Final Mark scheme
June 2024
,Question Marking Guidance Mark Comments
1. Buffers changes in temperature; 1. Accept
2 descriptions of
2. (Provides a) cooling effect (via evaporation);
01.1 (2 x buffering changes
AO1 in temperature,
) e.g. resists
temperature
changes
Question Marking Guidance Mark Comments
1. Evaporation/transpiration (from the porous
pot);
2. Accept
2. Tension created moves water (upwards); ‘negative
3 pressure’ for
3. Cohesion maintains the column of water
tension or ‘water
01.2 OR (1 x pulled’ or
AO2, ‘suction’.
Cohesion is due to hydrogen bonds 2x
between water (molecules); AO3) Ignore adhesion
but reject mark
point 3 if
adhesion used to
describe
attraction
between water
molecules.
Question Marking Guidance Mark Comments
0.8/0.85/0.848/0.8478 (using 1
01.3 3.14); OR (1 x
0.8482 (using π on calculator) AO2
)
, Question Marking Guidance Mark Comments
Correct answer within range of 7 to 7.5 = 2
marks;; Incorrect but shows division by 5500 2
02.1 = 1 mark (2 x
AO2
OR )
Answer shows correct number but
incorrect decimal place eg /
0.72 = 1 mark;
Question Marking Guidance Mark Comments
Correct answer of ..52 x 1013 in any
correct mathematical form = 2 marks;;
Incorrect but shows 5250 in any 2
02.2 correct mathematical form = 1
(2 x
mark
AO2
OR )
Incorrect but answer shows first three
numbers as 252 = 1 mark;
Question Marking Guidance Mark Comments
1. Osmosis does not occur; 1. Accept no net
flow of water for
2. (Red blood) cells do not burst/lyse/shrink; osmosis.
2. Accept
2 crenation (of red
02.3 blood cells).
(2 x
AO2 1. and 2. Accept
) converse eg
osmosis would
occur and cells
would
burst/lyse/shrink.
2. Accept cells
would be
larger/smaller.
Question Marking Guidance Mark Comments
1. Binding/complex between antigen 1. Ignore reference
2
A and (antibody) anti-A; to (antibody) anti-
02.4 (2 x B in donor.
2. (Causes red blood) cells to join/clump; AO2
2. Reject
)
‘clot/clotting’.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller SharpTutor. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $17.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
79373 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now