Marys Medicine

Gce

Mark Scheme (Results) Pearson Edexcel GCSE in Biology (5BI1F) Paper 01 Unit B1: Influences on Life Edexcel and BTEC Qualifications

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Summer 2015
Publications Code UG042584
All the material in this publication is copyright
Pearson Education Ltd 2015
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 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. For questions worth more than one mark, the answer column shows how partial credit can be allocated. This has been done by the inclusion of part marks eg (1). Where some judgement is required, mark schemes will provide the principles by which marks will be awarded and exemplification may When examiners are in doubt regarding the application of the mark scheme to a candidate's response, the team leader must be Crossed out work should be marked UNLESS the candidate has replaced it with an alternative response. Quality of Written Communication

Questions which involve the writing of continuous prose will expect candidates to: Write legibly, with accurate spelling, grammar and punctuation in order to make the meaning clear Select and use a form and style of writing appropriate to purpose and to complex subject matter Organise information clearly and coherently, using specialist vocabulary when appropriate. Acceptable answers Number
1(a)
4 marks for 4 correct responses 3 marks for 3 correct responses 2 marks for 2 correct responses 1 mark for 1 correct responses Acceptable answers Number
1(b)(i)
A  a supporting rod running
the length of their body Acceptable answers Number
1(b)(ii)
B  fish
Acceptable answers Number
1(c)
An explanation linking the  2 different / similar species named species  who interbreed (1) reproduce / mate Total for Question 1 = 8 marks Acceptable answers Number
2(a)(i)
Accept two marks for correct 77 ÷ 1.6 x 1.6 / 2.56 (1) accept 30.07 - 30.08 / 30.1 Acceptable answers Number
2(a)(ii)
A description to include two of writing in scientific journals (1) attending scientific conferences meeting / talking to other Acceptable answers Number
2(b)(i)
Answers must be in this order. insulin pancreas Acceptable answers Number
2(b)(ii)
A description to include two of diet carefully regulated / monitored/ less carbohydrate physical activity undertaken / medication (to lower blood Total for Question 2 = 8 marks Acceptable answers Number
3(a)(i)
Accept two marks for correct 6 (billion tonnes of carbon dioxide) Acceptable answers Number
3(a)(ii)
23 and 444 and 330 (1) Accept two marks for correct 797 (billion tonnes of carbon Acceptable answers Number
3(b)(i)
A suggestion from:  more heat trapped in the Earth's atmosphere (1)  (increased) greenhouse  more photosynthesis (1) Do not accept plants grow more Acceptable answers Number
3(b)(ii)
An explanation linking the  photosynthesis (1)  to make carbon glucose / carbohydrates Acceptable answers Number
3b(iii)
Any two suggestions from:
 reduce deforestation (1)  reduce burning fossil fuels Accept any practical example of the reduction of burning fossil  increase the planting of trees / plants (1) Total for Question 3 = 9 marks Acceptable answers Number
4(a)(i)
D  nucleus
Acceptable answers Number
4(a)(ii)
A  chromosome
Acceptable answers Number
4(a)(iii)
Acceptable answers Number
4(b)(ii)
ECF from clipped table for ff 25%, 0.25, ¼, 1 in 4 Reject ratio of 1:4 Acceptable answers Number
4(c)
An explanation to include two of  build up / thick mucus / sticky mucus (1)  blocking the pancreas / pancreatic duct / blocking the release of enzymes (1)  reduction in food digestion / absorption (1) Acceptable answers Number
4(d)(i)
An explanation to include the  both parents are both have a recessive allele / heterozygous / carriers (1) gene  person X inherited both the recessive alleles (1) Acceptable answers Number
4(d)(ii)
An explanation to include two of  red blood cells deformed / Accept misshaped / differently lower red blood cell count  blocking of capillaries / less oxygen carried (to muscles) oxygen carrying capacity of the blood is reduced (1)  muscles / joints ache (1) Do not accept "weakening"  less respiration by muscles Do not accept "tired" / less energy released (1) Total for Question 4 = 11 marks Acceptable answers Number
5(a)(i)
C  sensory neurone
Acceptable answers Number
5(a)(ii)
A  motor neurone
Acceptable answers Number
5(a)(iii)
An explanation linking the  fast (response) (1) automatic / immediate  no (further) damage is Acceptable answers Number
5(b)
A description linking two of the
 brain connected to the  spinal cord is connected to the skin / finger by Indicative Content Number
QWC
*5(c) A description to include some of the following points
Effect of alcohol  Alcohol is a depressant  Alcohol causes people to feel drowsy  Alcohol increases reaction times  Makes reactions slower  Impulses get to the brain slower  Neurotransmission is slower at the synapse Effect of caffeine  Caffeine is a stimulant  Caffeine causes people to be more alert  Caffeine shortens reaction time  Impulses get to the brain faster  Neurotransmission is quicker at the synapse  In extreme cases too much caffeine can have the opposite effect due to over stimulation No rewardable content  a limited description of either the effect of alcohol and / or caffeine  the answer communicates ideas using simple language and uses limited scientific terminology  spelling, punctuation and grammar are used with limited accuracy  a simple description of both alcohol and caffeine and related to reaction times OR a detailed description of alcohol or caffeine related to reaction time  the answer communicates ideas showing some evidence of clarity and organisation and uses scientific terminology appropriately  spelling, punctuation and grammar are used with some accuracy  a detailed description of both alcohol and caffeine on reaction including their actions as depressants and stimulants and a reference to action on nerve impulses or the synapse  the answer communicates ideas clearly and coherently uses a range of scientific terminology accurately  spelling, punctuation and grammar are used with few errors Total for Question 5 = 12 marks Number
6(a)(i)
lowest level should be approximately three times the size of the second level which should be approximately twice the size of the top level Acceptable answers Number
6(a)(ii)
Accept two marks for correct 1 500 and 800 (1) Acceptable answers Number
6(a)(iii)
must be in correct order. Indicative Content Number
QWC
*6(b) A description of two examples to include some of the following
 parasites live in or on their host  parasite and host live together but only the parasite headlice / ticks  live on their host  live off the blood of their host / suck blood tapeworm  live in their host  within the intestinal system  hooks and suckers attach to host intestines  flat body so tapeworm can easily absorb host's digested food molecules  outer layer has substances to ensure it is not digested by host  tapeworm eggs defecated and can also infect other vertebrates when swallowed  grows on host  roots grow into the hosts xylem and phloem vessels  absorbs the host's water and mineral ions No rewardable content  a limited description of one example of parasitism and / or definition of parasitism  the answer communicates ideas using simple language and uses limited scientific terminology  spelling, punctuation and grammar are used with limited accuracy  a simple description of at least two examples of parasitism or a detailed explanation of one  the answer communicates ideas showing some evidence of clarity and organisation and uses scientific terminology appropriately  spelling, punctuation and grammar are used with some accuracy  a detailed description of two examples of parasitism with reference to blood / digested food / mineral ions and water  the answer communicates ideas clearly and coherently uses a range of scientific terminology accurately  spelling, punctuation and grammar are used with few errors Total for Question 6 = 12 marks Pearson Education Limited. Registered company number 872828 with its registered office at 80 Strand, London, WC2R 0RL, United Kingdom

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