Core and Extended Cambridge IGCSE Biology

[Pages:45]Cambridge International Examinations

Core and Extended

Cambridge IGCSE

Biology

Study Guide

Answer key and markscheme

CONTENTS

Answer Key

1 Chapter Characteristics and classification of living organisms

2

2 Chapter Organisation of organisms

4

3 Chapter Movement in and out of cells

6

4 Chapter Biological molecules

7

5 Chapter Enzymes

9

6 Chapter Plant nutrition

10

7 Chapter Human nutrition

12

8 Chapter Transport in plants

13

9 Chapter Transport in animals

14

10 Chapter Diseases and immunity

16

11 Chapter Gas exchange in humans

18

12 Chapter Respiration

19

13 Chapter Excretion in humans

20

14 Chapter Coordination and response

22

Chapter 15Drugs

24

16 Chapter Reproduction

25

17 Chapter Inheritance

28

18 Chapter Variation and selection

30

19 Chapter Organisms and their environments

32

20 Chapter Biotechnology and genetic engineering

34

21 Chapter Human influences on ecosystems

36

Practice test markscheme

Practice Test (Paper 2)

40

Practice Test (Paper 4)

41

Cambridge IGCSE Biology Study Guide

Answers

Exercise 1

Multiple-choice questions

1

C

2

B

3

D

4

C

5

C

Structured questions

Question 1

2

carbon dioxide; urea;

Answer

Statement

Characteristic nutrition; respiration; growth; reproduction; sensitivity / movement; sensitivity;

3

Name of process

excretion;

nutrition;

homeostasis;

respiration;

reproduction;

4 (a)

P: Fungus; Q: Protoctista; R: Animal;

6

D

7

A

8

D

9

A

10

D

Marks

Guidance notes

[2]

[6]

[5] [3]

For internal use only. No distribution is allowed without permission. Prepared by Anthony Mok

2

Page 1

? 2017 NTK Publishing Limited

Question (b)

5

Answer

cell wall; hyphae; saprotrophic nutrition; spores;

D, C, B, E, A

Answer Key

Marks

Guidance notes

[max 2] [4]

For internal use only. No distribution is allowed without permission. Prepared by Anthony Mok

? 2017 NTK Publishing Limited

Page 2 3

Cambridge IGCSE Biology Study Guide

Exercise 2

Multiple-choice questions

1

B

2

A

3

C

4

B

5

B

6

C

7

C

8

C

Structured questions

Question 1 (a)

(b) (c)

2

Answer

cell B; contains cell wall / chloroplast / central vacuole; cell membrane labelled correctly

cell A: 2.5 cm 0.025 mm = 1000?; cell B: 3.5 cm 0.08 mm = 437.5?;

Marks [2] [1]

[2]

Guidance notes

Award [1] for any two structures identified

Organ Tissue Cell

Organelle

heart;

platelet;

vacuole;

blood;

white blood chloroplast;

stomach;

cell;

neurone;

[8]

3

ribosome chloroplast root hair cell

One less mark for each

xylem vessels leaf

[5] misplaced structure

For internal use only. No distribution is allowed without permission.

4

Prepared by Anthony Mok

? 2017 NTK Publishing LiPmaigteed3

Answer Key

Question 4

Answer

Cell structure Nucleus Ribosome Mitochondrion Cell membrane

Cytoplasm Cell wall

Chloroplast

Function contains genetic materials to control cell activities; synthesizes proteins; produces energy by aerobic respiration; controls exit or entry of substances into or out of cell; allows metabolic reactions to take place; maintains cell shape / prevents the cell from bursting; for photosynthesis;

Marks [7]

Guidance notes

For internal use only. No distribution is allowed without permission. Prepared by Anthony Mok

? 2017 NTK Publishing Limited

Page 4 5

Cambridge IGCSE Biology Study Guide

Exercise 3

Multiple-choice questions

1

C

6

2

A

7

3

B

8

4

D

9

5

D

Structured questions

Question 1 (a)

(b)

Answer

diffusion; higher concentration of bromine gas in the right hand side;

increase temperature; increase the concentration of bromine gas;

Marks [2] [2]

2

no

no

water

yes

[4]

3 (a) (b)

(c)

root hair cell;

against concentration gradient; using energy; requires protein pump / protein carrier;

high solute concentration (in root hair cell) / lowers water potential (in root hair cell); water enters by osmosis;

[1] [max 2]

[2]

D B B C

Guidance notes

For internal use only. No distribution is allowed without permission.

6

Prepared by Anthony Mok

? 2017 NTK Publishing LiPmaigteed5

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