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Edexcel A Level Biology Paper 2 Mark Scheme June 2022: GCE In Biology B (9BI0/02) Paper 2 | Advanced Physiology, Evolution and Ecology

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Edexcel A Level Biology Paper 2 Mark Scheme June 2022: GCE In Biology B (9BI0/02) Paper 2 | Advanced Physiology, Evolution and Ecology. A calculation that makes reference to the following points: • correct calculation of percentage cytosine (1) • correct calculation of number of nucleotides (1) 15 % cytosine 15 % of 10 000 = 1500 Correct answer with no working gains full marks One mark for 15 % (2) Question Number Answer Additional Guidance Mark 2 (a)(i) The only correct answer is: C low auxin, high cytokinin A is incorrect as high auxin inhibits lateral shoots B is incorrect as high auxin inhibits lateral shoots D is incorrect as low cytokinin inhibits lateral shoots (1) 6 Question Number Answer Additional Guidance Mark 2(a)(ii) An explanation that makes reference to three of the following points: • auxin binds with {receptor / transcription factor} (inside cell / in cytoplasm / in nucleus) (1) • transcription factor becomes active / is activated (1) • transcription factor binds to {DNA / promoter} (1) • switches on / causes {transcription / production of RNA} (1) Accept forms auxin-receptor complex Accept forms hormone-receptor complex Do not accept if receptor on cell membrane Accept transcription factor changes shape Accept auxin-receptor complex becomes a transcription factor Accept auxin-receptor complex binds to DNA / promoter (1) (3) 7 Question Number Answer Additional Guidance Mark 2(b) An answer that makes reference to four of the following points: • more seeds germinate when last colour is red (1) • number of exposures to light makes no difference (1) • significant difference when last colours are different as standard deviations do not overlap (1) • red light converts PR into PFR / far red light converts PFR into PR (1) • {PFR stimulates/ PR inhibits} {germination / gibberellin release / activation of amylase / abscisic acid} Allow converse for FR light Accept no significant difference when last colours are same as standard deviations overlap (1) Accept P725 or P730 for PFR / P665 or P660 for PR Accept high PFR : low PR ratio stimulates germination (4) Question Number Answer Additional Guidance Mark 8 3 (a) (i) The only correct answer is: D smooth endoplasmic reticulum A is incorrect as centriole has microtubules B is incorrect as a nucleus has a nucleolus C is incorrect as there are no ribosomes (1) Question Number Answer Additional Guidance Mark 3 (a)(ii) The only correct answer is: D P S R A is incorrect because the SER is not involved in protein synthesis B is incorrect because Golgi should be after the RER C is incorrect because the SER is not involved in protein synthesis

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Edexcel A Level Biology Paper 2 Mark Scheme
June 2022: GCE In Biology B (9BI0/02) Paper 2:
Advanced Physiology, Evolution and Ecology

,Mark Scheme (Results)

Summer 2022

Pearson Edexcel GCE
In Biology B (9BI0/02)
Paper 2: Advanced Physiology, Evolution and
Ecology

,Edexcel and BTEC Qualifications

Edexcel and BTEC qualifications are awarded by Pearson, the UK’s largest awarding body. We provide
a wide range of qualifications including academic, vocational, occupational and specific programmes
for employers. For further information visit our qualifications websites at www.edexcel.com or
www.btec.co.uk. Alternatively, you can get in touch with us using the details on our contact us page
at www.edexcel.com/contactus.




Pearson: helping people progress, everywhere

Pearson aspires to be the world’s leading learning company. Our aim is to help everyone progress in
their lives through education. We believe in every kind of learning, for all kinds of people, wherever
they are in the world. We’ve been involved in education for over 150 years, and by working across
70 countries, in 100 languages, we have built an international reputation for our commitment to high
standards and raising achievement through innovation in education. Find out more about how we
can help you and your students at: www.pearson.com/uk

, General Marking Guidance



• All candidates must receive the same treatment. Examiners
must mark the first candidate in exactly the same way as they
mark the last.
• Mark schemes should be applied positively. Candidates must
be rewarded for what they have shown they can do rather
than penalised for omissions.
• Examiners should mark according to the mark scheme not
according to their perception of where the grade boundaries
may lie.
• There is no ceiling on achievement. All marks on the mark
scheme should be used appropriately.
• All the marks on the mark scheme are designed to be
awarded. Examiners should always award full marks if
deserved, i.e. if the answer matches the mark
scheme. Examiners should also be prepared to award zero
marks if the candidate’s response is not worthy of credit
according to the mark scheme.
• Where some judgement is required, mark schemes will
provide the principles by which marks will be awarded and
exemplification may be limited.
• When examiners are in doubt regarding the application of
the mark scheme to a candidate’s response, the team leader
must be consulted.
• Crossed out work should be marked UNLESS the candidate
has replaced it with an alternative response.
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