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Mark Scheme (Results) November 2009

GCSE

360Science GCSE Additional Science Structured Paper B2 (5016F/1F) GCSE Biology Structured Paper B2 (5028F/1F)

Edexcel Limited. Registered in England and Wales No. 4496750 Registered Office: One90 High Holborn, London WC1V 7BH


Edexcel is one of the leading examining and awarding bodies in the UK and throughout the world. We provide a wide range of qualifications including academic, vocational, occupational and specific programmes for employers. Through a network of UK and overseas offices, Edexcel’s centres receive the support they need to help them deliver their education and training programmes to learners. For further information, please call our GCE line on 0844 576 0025, our GCSE team on 0844 576 0027, or visit our website at www.edexcel.com.

If you have any subject specific questions about the content of this Mark Scheme that require the help of a subject specialist, you may find our Ask The Expert email service helpful. Ask The Expert can be accessed online at the following link: http://www.edexcel.com/Aboutus/contact-us/

Alternately, you can speak directly to a subject specialist at Edexcel on our dedicated Science telephone line: 0844 576 0037

November 2009 Publications Code UG022230 All the material in this publication is copyright Š Edexcel Ltd 2009

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Using the Mark Scheme 1.

This mark scheme gives you;

* an idea of the type of response expected * how individual marks are to be awarded * the total mark for each question * examples of responses that should not receive credit.

2.

; separates points for the award of each mark.

3.

/ means that the responses are alternatives and either answer should receive full credit.

4.

( ) means that a phrase/word is not essential for the award of the mark but helps the examiner to get the sense of the expected answer.

5.

Phrases/words in bold indicate that the meaning of the phrase/word is essential to the answer.

6.

OWTTE (or words to that effect) and eq (equivalent) indicate that valid alternative answers (which have not been specified) are acceptable.

7.

‘Ignore’ means that this answer is not worth a mark but does not negate an additional correct response.

8.

‘Reject’ means that the answer is wrong and negates any additional correct response for that specific mark.

9.

ORA (or reverse argument) indicates that the complete reverse is also valid for the award of marks.

10.

ecf (error carried forward) means that a wrong answer given in an earlier part of a question is used correctly in answer to a later part of the same question.

Marking 1.

Suggestion/explanation questions should be marked correct even when the suggestion is contained within the explanation.

2.

Do not award marks for repetition of the stem of the question.

3.

Make sure that the answer makes sense. Do not give credit for correct words/phrases which are put together in a meaningless manner. Answers must be in the correct scientific context.

Amplification 1.

In calculations, full credit must be given for a bald, correct answer. If a numerical answer is incorrect, look at the working and award marks according to the mark scheme.

2.

Consequential marking should be used in calculations. This is where a candidate's working is correct but is based upon a previous error. When consequential marks have been awarded write "ecf" next to the ticks.

3.

If candidates use the mole in calculations they must be awarded full marks for a correct answer even though the term may not be on the syllabus at their level.

4.

If candidates use chemical formulae instead of chemical names, credit can only be given if the formulae are correct.

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Question Number 1

Correct Answer

Mark

All lines correct – 2 marks 1 or 2 lines correct – 1 mark makes the sugar called glucose photosynthesis

given

makes carbon dioxide respiration uses light

occurs in plant and animal cells (2) Question Number 2

Correct Answer

Mark (1) (1) (1)

two / 2 ; DNA ; nucleus ;

(3) Question Number 3(a)

Correct Answer

Additional guidance Ignore refs. to portions / peaches

4;

Mark

(1)

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Question Number 3(b)

Correct Answer

Reject

Mark

1. 2. 3. 4.

bananas do not have any vitamin D ; bananas do not supply enough vitamin C ; bananas do not supply enough calcium ; eating different fruit and vegetables give a (balanced) diet / range of vitamins / minerals; 5. eat mushrooms to supply vitamin D ; 6. too many bananas provide too much potassium ; 7. bananas contain too much vitamin E; (2) Question Number 4.

Correct Answer

Reject

Any two from:

Ignore: refs to water /sun

1. absorbs more sunlight / lower leaves not shaded / maximum light; 2. more photosynthesis ; 3. more glucose / more respiration /more energy ; 4. more surface area of leaf exposed ; 5. out competes other species ;

Mark

(2) Question Number 5(a)(i)

Question Number 5(a)(ii)

Correct Answer 1. incomplete combustion of burning fossil fuels ; 2. cars / vans /factories / power stations. eq ; Correct Answer 1. global warming / greenhouse gases / climate change; 2. (increase) ozone ;

Acceptable Answers faulty / badly maintained boilers

Reject

Mark

(1) Acceptable Answers consequence of global warming

Reject

Mark

(1)

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Question Number 5(b)

Correct Answer

Acceptable Answers

Reject

Mark

1. marathon runners use aerobic respiration ; 2. carbon monoxide reduces oxygen carried in the blood; 3. running through the city (where carbon monoxide will be higher) ; 4. running for longer ; 5. breathing in more carbon monoxide; (2)

Question Number 6(a)(i)

Correct Answer

Acceptable Answers

Any two from:

credit a linked reason e.g. for 1. reason = more salmon survive 2. more energy for growth 3. fish are closer together

1. protects from predators ; 2. stops them swimming so much; 3. mating easier / easier to find a mate

Mark

(2) ignore refs. to fish feeder

Question Number 6(a)(ii)

Correct Answer

Acceptable Answers

Any two from: 1. feeds regularly ; 2. high protein diet ; 3. do not have to search / find food ; 4. do not compete with other species for food

credit a linked reason e.g. for 1. maintain growth rate 2. fish grow at maximum rate 3. energy not used for swimming to (find food)

Mark

(2)

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Question Number 6(b)

Correct Answer

Acceptable Answers

Mark

Any two from: 1. fewer plants / species / animals ; 2. faeces / uneaten food / waste covers / buries the plants ; 3. less light ; 4. less photosynthesis ; 5. less growth of plants ; 6. toxic / poisonous (to living things) just ‘kills animals’ too vague ; 7. increase numbers of bacteria ; 8. makes conditions anaerobic ; 9. credit increased plant growth / detritivores if linked to organisms not under the cage ; (2) 10. as more nutrients available (linked to 9) ;

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Question Number 7(a)

Answer

Additional guidance

Mark

Accept: unspecialised;

1. they can become any type of (body) cell or tissue / they are undifferentiated;

Ignore: organs / limbs

2. they have no Hayflick limit/description – eg no limit to the number of divisions;

Question Number 7(b)

(1)

Answer

Additional guidance

Any two from: 1. curing a genetic disease / named genetic disease / cancer;

Accept : Parkinson’s disease/ diabetes/ leukaemia

2. growing new organs/limbs ;

Accept: repair e.g. heart tissue /growing organs for transplant Ignore: organ transplant”

3. less chance of rejection (if grown from own stem cell) ;

“More successful transplants” is insufficient

4. increase understanding of cell development owtte;

Mark

Ignore: cloning (2)

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Question Number 8

Answer

process use oxygen in cells produce oxygen in cells use CO2 in cells produce CO2 in cells

Mark

animals day night (light) (dark) yes yes

plants day (light) yes

night (dark) yes

no

no

yes

no

no

no

yes

no

yes

yes

yes

yes

3 marks for 4 rows correct 2 marks for 3 rows correct 1 marks for 1 or 2 rows correct Accept ticks and crosses, If no’s are left blank do not credit

10

(3)


Question Number 9(a)

Answer

Mark

24 ; Question Number 9(b)

(1)

Answer

Additional guidance

the lungs / respiratory system / nervous system not sufficiently developed to sustain life / no surfactant produced ;

Accept: not able to breathe. Accept: organs not developed fully / properly / enough.

Mark

Ignore: refs to fetus not being viable /not developed enough

Question Number 9(c)

Answer

Additional guidance

(1)

Mark

the belief that the fetus has a right to life / the belief of a named religious group that life begins at conception ; (1)

Question Number 9(d)

Answer

Additional guidance

(continuation of pregnancy) will put the life of the mother at severe risk / mother may die / if the child is severely disabled;

Accept: will put the life of the mother at risk

Mark

(1)

TOTAL MARK 30

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Further copies of this publication are available from Edexcel Publications, Adamsway, Mansfield, Notts NG18 4FN Telephone 01623 467467 Fax 01623 450481 Email publications@linneydirect.com Order Code UG022230 November 2009 For more information on Edexcel qualifications, please visit www.edexcel.com/quals Edexcel Limited. Registered in England and Wales no.4496750 Registered Office: 190 High Holborn, London WC1V 7BH


5016F_5028F_B2_msc_20091211_UG022230  

GCSE Additional Science Structured Paper B2 (5016F/1F) 360Science GCSE Edexcel Limited. Registered in England and Wales No. 4496750 Register...

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