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BiologyUnit: 4BI0 Science (Double Award) 4SC0 Paper: 1BPractice Essay Questions: Paper D Time: 1 hour

Paper Reference

Surname

Write your name hereOther names

Centre Number Candidate Number

Total MarksYou do not need any other materials.

Pearson Edexcel International GCSE

Turn over

4BI0 004ilikegcse.tumblr.com

Instructions

Use black ink or ball-point pen. Fill in the boxes at the top of the page with your name,centre number and candidate number. Answer TWO questions from Section A and TWO questions from Section B. Answer the questions in the spaces provided- there may be more space than you need. !

Information

The total mark for this paper is 40. The marks for each question are shown in brackets- use this as a guide as to how much time to spend on each question. !

Advice

Read each question carefully before you start to answer it. Keep an eye on the time. Write your answers neatly and in good English. Check your answers if you have time at the end.

4BI0/1B 4SC0/1B

!SECTION A !

Answer TWO questions in this section. Where appropriate you may draw diagrams to make your answer clearer. !!

1 (a) Describe the differences between aerobic and anaerobic respiration in mammals. (4) !

(b) Suggest why smaller mammals often have a higher respiration rate than larger mammals. (4)

(Total for Question 1 = 8 marks) !

2 (a) Describe the similarities between the changes that take place in water polluted by sewage and in water polluted by fertilisers.

(4) ! (b) Explain why there is a limit to the number of links found in food chains.

(4)

(Total for Question 2 = 8 marks) !3 (a) Explain how the growth of microorganisms in a fermenter would be affected if the paddles failed to work.

(4) ! (b) What are cloned transgenic animals and how might they be of use in the future?

(4)

(Total for Question 3 = 8 marks) !!!!!!!!!Begin your answer on page 3. !!!!!!!!

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SECTION A: FIRST CHOSEN QUESTION Indicate which question you are answering by marking a cross in the box .

If you change your mind, put a line through the box and then indicate your newquestion with a cross . !

Chosen question number: Question 1

Question 2

Question 3 !.........................................................................................................................................................................................................................................................

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SECTION A: SECOND CHOSEN QUESTION Indicate which question you are answering by marking a cross in the box .

If you change your mind, put a line through the box and then indicate your newquestion with a cross . !

Chosen question number: Question 1

Question 2

Question 3 !.........................................................................................................................................................................................................................................................

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TOTAL FOR SECTION A = 16 MARKS !4

!SECTION B !

Answer TWO questions in this section. Where appropriate you may draw diagrams to make your answer clearer. !!

4 Describe the methods that can be used by farmers to increase the production of food crops. !!

(Total for Question 4 = 12 marks) !5 How does the structure of different blood vessels help them to carry out their roles? !!

(Total for Question 5 = 12 marks)

6 Describe how the human kidney is able to regulate the concentration of the blood. !!

(Total for Question 6 = 12 marks) !!!!!!!!!!!!!Begin your answer on page 6. !!!!!!!!!!!!!!!

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SECTION B: FIRST CHOSEN QUESTION Indicate which question you are answering by marking a cross in the box .

If you change your mind, put a line through the box and then indicate your newquestion with a cross . !

Chosen question number: Question 4

Question 5

Question 6 !.........................................................................................................................................................................................................................................................

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SECTION B: SECOND CHOSEN QUESTION Indicate which question you are answering by marking a cross in the box .

If you change your mind, put a line through the box and then indicate your newquestion with a cross . !

Chosen question number: Question 4

Question 5

Question 6 !.........................................................................................................................................................................................................................................................

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......................................................................................................................................................................................................................................................... !TOTAL FOR SECTION B = 24 MARKS.....

TOTAL FOR PAPER = 40 MARKS..... !9

ADDITIONAL PAGE !Use these pages if you require more answer space.

If you want this page to be examined, place a cross in this box . Clearly write the question number e.g. 3(a) on the left hand side before starting your answer. !

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ADDITIONAL PAGE !Use these pages if you require more answer space.

If you want this page to be examined, place a cross in this box . Clearly write the question number e.g. 3(a) on the left hand side before starting your answer. !

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BLANK PAGE

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The questions in this paper are taken from the GCE O Level in Biology (syllabus 7040) Paper 2. Exam series: January 2009

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