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iGCSE Biology

Total questions: 79

Worksheet time: 1hrs 19mins

Name
Class
Date
1.

Penguins live in the Antarctic, which of the following is an adaptation that allows the penguin to survive the very cold region?

a)

Swimming under water

b)

Black and White body color

c)

Extra fatty layer for warmth

d)

Little wings

2.

___________ reproduction happens when sex cells from both parents join.

a)

Asexual

b)

Sexual

c)

Binary fission

d)

Budding

3.

Inherited traits are controlled by

a)

nucleus

b)

chromosomes

c)

genes

d)

cells

4.

____________ transports water up the plant from the roots

a)

Phloem

b)

Cambium

c)

Leaves

d)

Xylem

5.

What is so unique about these cells?

a)

They do not contain a nucleus

b)

They do not contain water

c)

They contain iron

d)

They are not actually red

6.
the joining of a sperm and egg
a)
fertilization
b)
meiosis
c)
mitosis
d)
genetics
7.
The process that occurs in the formation of sex cells by which the number of chromosomes is reduced by half.
a)
meiosis
b)
mitosis
c)
fertilization
d)
pacification
8.
How many chromosomes in a normal human body cell?
a)
46
b)
23
c)
92
d)
2
9.

The sex chromosomes of a human female are

a)

XX

b)

XY

c)

YY

d)

VV

10.
What is a phenotype
a)
The genetic make up (code)
b)
The physical trait
11.
Which type of respiration occurs in the presence of oxygen?
a)
Aerobic
b)
Anaerobic
12.

Gas exchange is needed to supply _____________ to cells and remove __________________

a)

carbon dioxide; oxygen

b)

oxygen; food

c)

oxygen; carbon dioxide

d)

carbon dioxide; water

13.
Respiration is the 
a)
Intake of oxygen and release of carbon dioxide over a membrane
b)
Release of energy from food inside cells
c)
Mechanical movement to inhale and exhale air
d)
Feature that enable an animal to survive in its habitat
14.
Letter D is pointing to which Respiratory organ?
a)
Alveoli
b)
Diaphragm
c)
Lung
d)
Bronchi
15.

The air sacs that are covered with capillaries where gas exchange takes place.

a)

Bronchi

b)

Trachea

c)

Oxygen

d)

Alveoli

16.
Identify the diaphragm.
a)
C
b)
D
c)
E
d)
F
17.

What do the cilia do?

a)

Catch dust and microbes

b)

Waft mucus and trapped dust and microbes up and out of the lungs

c)

Help the cells lining the windpipe to move about

18.

Many chemicals in cigarettes are considered carcinogenic because they cause what?

a)

Emphysema

b)

Cancer

c)

Heart disease

d)

Liver Failure

19.

What keeps your bronchi and bronchiole tubes open?

a)

cartilage rings

b)

ligament squares

c)

ciliated cells

d)

muscle

20.

When exhaling,. the diaphragm...

a)

Contracts

b)

Relaxes

21.
Fungi are usually...
a)
Multicellular
b)
Unicellular
22.
All of the following have a nucleus except...
a)
bacteria
b)
animals
c)
plants
d)
protists
23.
This is Spirogyra which is a type of alga found in ponds. Name the green structures within the cytoplasm.
a)
Nucleus
b)
Mitochondria
c)
Chloroplasts
d)
Cytoplasm
24.
This is an image of a nucleus. What is the name of the chemical found inside the nucleus which contains the genetic code?
a)
RNA
b)
DNA
c)
CNA
d)
TNA
25.
Plant cells are shown in this picture. The pale blue structures are...
a)
Cell membrane
b)
Cytoplasm
c)
Cell wall
d)
Chlorplasts
26.

Cell organelle that stores materials such as water, salts, proteins, and carbohydrates

a)

Centriole

b)

Vacuole

c)

Ribosome

d)

Lysosome

27.

Cell organelle that converts the chemical energy stored in food into compounds that are more convenient for the cell to use

a)

Chloroplast

b)

Mitochondria

c)

Golgi apparatus

d)

Endoplasmic reticulum

28.

Property of biological membranes that allows some substances to pass across it while others cannot;

a)

Cell Membrane

b)

Cell Wall

c)

Selectively Permeable

d)

Cell Theory

29.

Sugar is a...

a)

solvent

b)

solution

c)

solute

30.

In which one will osmosis be fastest?

a)

A

b)

B

c)

C

d)

D

31.

Potato squares in solution

a)

Q will get smaller

b)

P will get smaller

c)

P will get bigger

32.
a)
X = Artery
Y = Vein
Z= Capillary
b)
X = Artery
Y = Capillary
Z= Vein
c)
X = Vein
Y = Artery
Z= Capillary
d)
X = Vein
Y = Capillary
Z= Artery
33.

Which of these is the correct definition for 'nutrition'?

a)

Getting rid of toxic waste products

b)

Making food or taking it in through eating or absorbing

c)

Releasing energy from food

d)

Responding to external stimuli

34.

Which of these is the correct definition for 'sensitivity'?

a)

Getting rid of toxic waste products

b)

Making food or taking it in through eating or absorbing

c)

Releasing energy from food

d)

Responding to external stimuli

35.

The cell wall of plants is made of...

a)

Keratin

b)

Haemoglobin

c)

Cellulose

d)

Chitin

36.

The letter B represents...

a)

The enzyme

b)

The substrate

c)

An enzyme-substrate complex

d)

The active site of the enzyme

37.

The letter C represents...

a)

The enzyme

b)

The substrate

c)

An enzyme-substrate complex

d)

The active site of the enzyme

38.

What is the optimum pH of this pepsin?

a)

pH 2

b)

pH 3

c)

pH 7.5

d)

pH 8

39.

Which of these correctly describes the test for starch?

a)

Add Benedicts solution, then gently warm

b)

Add Biuret reagent

c)

Add iodine solution

d)

Add alcohol, stir, then add water

40.

Which of these correctly describes the test for glucose?

a)

Add Benedicts solution, then gently warm

b)

Add Biuret reagent

c)

Add iodine solution

d)

Add alcohol, stir, then add water

41.

Which of these correctly describes the test for protein?

a)

Add Benedicts solution, then gently warm

b)

Add Biuret reagent

c)

Add iodine solution

d)

Add alcohol, stir, then add water

42.

Which of these correctly describes the test for lipids?

a)

Add Benedicts solution, then gently warm

b)

Add Biuret reagent

c)

Add iodine solution

d)

Add alcohol, stir, then add water

43.

Which of these correctly describes the positive result for a test for lipids?

a)

Turns from blue to green, yellow, orange or brick red

b)

Turns from blue to purple

c)

Turns from yellow to blue-black

d)

A cloudy white emulsion forms

44.

The passive movement of particles from an area of high concentration to an area of low concentration is known as...

a)

Diffusion

b)

Osmosis

c)

Active Transport

d)

Ventilation

45.

The correct equation for respiration is...

a)

C6H12O6 + 6O2 → 6CO2 + 6H2O

b)

C6H12O6 + O2 → CO2 + H2O

c)

C12H6O12 + 6O2 → 6CO2 + 6H2O

d)

6CO2 + 6H2O → C6H12O6 + 6O2

46.

A collection of cells working together to do a specific function is...

a)

a tissue

b)

an organ

c)

an organ system

d)

a cell

47.

Which organ system includes the mouth, pancreas and stomach and involves the physical and mechanical breakdown of food in order to absorb it into the blood?

a)

Respiratory System

b)

Circulatory System

c)

Digestive System

d)

Excretory System

48.

Which of these diseases causes a decrease in surface area of the alveoli?

a)

Lung Cancer

b)

Bronchitis

c)

Emphysema

d)

Asthma

49.

Which of these diseases is caused by the carcinogenic tar in cigarettes?

a)

Lung Cancer

b)

Bronchitis

c)

Emphysema

d)

Asthma

50.

What is peristalsis?

a)

The breakdown of lipids into smaller droplets

b)

The absorption of glucose by the microvilli in the small intestine

c)

The movement of the food bolus along the gut through muscle contraction

d)

The secretion of bile from the gall bladder into the duodenum

51.

1 is the...

a)

left atrium

b)

left ventricle

c)

right atrium

d)

right ventricle

52.

4 is the...

a)

left atrium

b)

left ventricle

c)

right atrium

d)

right ventricle

53.

6 is the...

a)

aorta

b)

vena cava

c)

pulmonary artery

d)

pulmonary vein

54.

What is produced by anaerobic respiration in yeast?

a)

Lactic acid and carbon dioxide

b)

Lactic acid only

c)

Carbon dioxide and ethanol

d)

Carbon dioxide only

55.
The leaf has a shiny, waxy cuticle around it to
a)
increase the rate of photosynthesis
b)
attract more light
c)
control water loss
d)
stop carbon dioxide and oxygen gases escaping
56.
The role of the guard cell is to
a)
help control the temperature of the plant
b)
control how much water enters the leaf
c)
control how much glucose is stored
d)
control the movement of water vapour & gases 
57.

What is the name of the elongated, packed cells (part G) directly under the upper epidermis?

a)

Palisade cells

b)

Guard cell

c)

Spongy layer

d)

Lower epidermis

58.
Where in the female body do the egg and sperm fuse?
a)
Cervix
b)
Uterus
c)
Ovary
d)
Fallopian tube
59.
What is implantation?
a)
Zygote adheres to the uterus lining
b)
Early embryo adheres to the uterus lining
c)
Foetus adheres to the uterus lining
d)
Zygote feeds off the uterus lining
60.
What happens to the egg if no pregnancy occurs?
a)
It is re-used
b)
Is comes out with the next period
c)
It disintegrates
d)
It is reabsorbed by the ovary
61.

Which arrow is pointing to the style?

a)

Red

b)

Blue

c)

Purple

d)

Yellow

62.

What is the blue arrow pointing to?

a)

Stigma

b)

Style

c)

Ovary

d)

Carpal

63.

What is pollination?

a)

When a pollen grain lands on a stigma

b)

When a pollen grain fuses with an ovule

c)

When a seed is formed

d)

When a seed grows into a plant

64.

Why is carbon dioxide important for plants?

a)

Carbon dioxide gives plants their green color.

b)

Plants can release carbon dioxide into the air.

c)

Plants use carbon dioxide to make their own food.

d)

Carbon dioxide lets plants absorb their roots.

65.

What is the first element of the food web?

a)

Eagle

b)

Sun

c)

Water

d)

Wolf

66.

Which organism in a food web is a producer?

a)

Aphid

b)

Beetle

c)

Rosebush

d)

Spider

67.

Plants in a food web are:

a)

consumers

b)

decomposers

c)

producers

d)

suppliers

68.

Which hormone is known as the fight or flight hormone?

a)

Adrenaline

b)

Glucagon

c)

Insulin

d)

Glycogen

69.

A hormone is a chemical substance produced by ...

a)

A gland

b)

The liver

c)

A target organ

d)

The blood

70.

The diagram shows a person sweating in hot weather. What part is played by the sweat glands during the process of sweating?

a)

Effector

b)

Receptor

c)

Sense Organ

d)

Stimulus

71.

Which letter represents a part that may undergo vasodilation?

a)

C

b)

D

c)

E

d)

F

72.

What type of neuron is A?

a)

Sensory

b)

Inter

c)

Motor

73.

What type of neuron is C?

a)

Sensory

b)

Inter

c)

Motor

74.

What type of nervous message is carried along neurons?

a)

Chemical

b)

Electrical

75.

What is the gap between two neurons called?

a)

Impulse

b)

Synapse

c)

CNS

d)

Inter neuron

76.

Name an effector in this diagram.

a)

A

b)

B

c)

D

d)

E

e)

F

77.

Name an receptor in this diagram.

a)

A

b)

B

c)

D

d)

E

e)

F

78.

Select two examples of effectors.

a)

Neuron

b)

Gland

c)

Muscle

d)

Receptor

79.

Which statement best describes a reflex?

a)

Slow response that you have to think about

b)

Rapid response to protect body from harm

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