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Worksheets2.1 Adaptations for Gas Exchange
Total questions: 24
Worksheet time: 9mins
When you breathe, your lungs take in ___ and remove ___.
air/oxygen
oxygen/carbon dioxide
carbon dioxide/waste
waste/air
The air sacs that are covered with capillaries where gas exchange takes place
bronchi
lungs
oxygen
alveoli
The division of the trachea forms
main bronchi
alveoli
lungs
nose
Which of the following are features of the alveoli that adapt them to gas exchange?
I. High surface area
II. Thin walls
III. Dry surfaces
I and II only
I only
II and III
I, II, and III
What happens when you breathe in? (tick all that apply)
diaphragm relaxes and moves up
diaphragm contracts and flattens
increases volume in thorax
reduces volume in thorax
What happens when you breathe in? (tick all that apply)
diaphragm relaxes and moves up
diaphragm contracts and flattens
increases volume in thorax
reduces volume in thorax
pressure in thorax lower than outside
Name the structure through which gases enter and leave the body of an insect.
tracheoles
alveoli
spiracle
lungs
Name the small tubes that carry gases directly to and from the cells of an insect
tracheoles
system
spiracle
alveoli
Tubifex worms are small, thin animals that live in water. They have no specialised gas exchange or circulatory system. Name the process by which oxygen reaches the cells inside the body of a tubifex worm.
active transport
respiration
diffusion
facilitated diffusion
Which are features of leaves of xerophytes? (tick all that apply)
thick cuticle
flat leaves
hairs on leaves
raised stomata
Suggest appropriate units for comparing the distribution of stomata on leaves.
stomata per m2
stomata per mm2
stomata per cm2
stomata per km2
The diagram shows the structure of the human gas exchange system. Name organ P.
alveolus
trachea
bronchus
diaphragm
The diagram shows the structure of the human gas exchange system. Name organ Q.
alveolus
trachea
bronchus
diaphragm
Which adaptations help reduce water loss in insects? (tick all that apply)
guard cells that open and close the spiracles
valves that open and close the spiracles
hairs around the spiracles
Name the structure that protects fish gills from damage.
filaments
lamellae
operculum
gill arch
What area would a typical humans' alveoli cover, if laid out flat?
50m2
70m2
90m2
150m2
Just before a person starts to exhale, the composition of the air in an alveolus differs from the composition of the air in the trachea. How would the composition differ? (tick all that apply)
less oxygen
more oxygen
more carbon dioxide
more water vapour
less water vapour
What is meant by a counter-current system?
A short distance for gases to diffuse
When water flows in an opposite direction to blood flow
having a higher concentration inside the lungs than outside
With an increase of surface area to volume ratio, what happens to rate of gas exchange?
the rate of gas exchange increases
gas exchange decreases
fish breathe faster
diffusion of oxygen decreases
Name the three parts of a gill.
filament, lamellae, gill arch
filament, lamellae, operculum
surface area, filaments, gill
When particles move from area of high concentration to area of low concentration, this is...
osmosis
diffusion
concentration gradient
During inspiration the fish mouth is open and during expiration the fish mouth is closed.
What is the percentage dissolved oxygen in water?
1%
5%
10%
20%
