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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