Mark Scheme (Results)
January 2021
Pearson Edexcel International GCSE
In Biology (4BI1) Paper 1B and Science (Double
Award) (4SD0) Paper 1B
,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
January 2021
Publications Code 4BI1_1B_2101_msc
All the material in this publication is copyright
© Pearson Education Ltd 2021
, Question Answer Mark
Number
1(a) 1
The only correct answer is B 1
A is not correct as 0 is not the correct number of
chromosomes
C is not correct as 2 is not the correct number of
chromosomes
D is not correct as 23 is not the correct number of
chromosomes
Question Answer Mark
Number
1(b) An explanation that makes reference to the following points: 2
• energy / ATP / respiration /eq (1)
• movement / swimming / tail movement/ eq (1)
Question Answer additional Mark
Number guidance
1(c) An explanation that makes reference to two of 2
the following points:
• digest / break down egg membrane / eq ignore wall /
(1) shell etc
• allow (nucleus) to enter / penetrate egg
(1)
• fertilisation / fusion (1)
January 2021
Pearson Edexcel International GCSE
In Biology (4BI1) Paper 1B and Science (Double
Award) (4SD0) Paper 1B
,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
January 2021
Publications Code 4BI1_1B_2101_msc
All the material in this publication is copyright
© Pearson Education Ltd 2021
, Question Answer Mark
Number
1(a) 1
The only correct answer is B 1
A is not correct as 0 is not the correct number of
chromosomes
C is not correct as 2 is not the correct number of
chromosomes
D is not correct as 23 is not the correct number of
chromosomes
Question Answer Mark
Number
1(b) An explanation that makes reference to the following points: 2
• energy / ATP / respiration /eq (1)
• movement / swimming / tail movement/ eq (1)
Question Answer additional Mark
Number guidance
1(c) An explanation that makes reference to two of 2
the following points:
• digest / break down egg membrane / eq ignore wall /
(1) shell etc
• allow (nucleus) to enter / penetrate egg
(1)
• fertilisation / fusion (1)
