Gas Exchange in Fish and insects (AQA A level Biology)

What is the concentration of oxygen in water?

• 1%

• 20%

• 0.01%

• 80%

How many pairs of gills does a fish have?

• 1

• 2

• 3

• 4

What are the 'ridges' (which increase surface area) on gill filaments called?

• lumen

• lamellae

• alveoli

• leaves

Which term is used to describe the opposite flow of blood and water across gills?

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

What is the function of gills in fish?

• absorbing carbon dioxide
• assisting in food digestion
• protecting a fish's lungs
• taking in dissolved oxygen

True of False?
The gill cover is called the Operculum.

• True
• False

True or False?
During inspiration the fish mouth is open and during expiration the fish mouth is closed.

• True
• False

To overcome the low percentage of dissolved oxygen in water, bony fish have two major adaptations. These include?

• Ventilation of the gills and unidirectional supply of water

• Unidirectional supply of water and counter-current exchange of gases

• Ventilation of the gills and counter-current exchange of gases.