Grade 8 - Comparing Gas Exchange

Which one of the following is true for gas exchange?

• the movement of lungs.

• the exchange of oxygen and carbon dioxide in lungs

• the release of energy in cells

Select all the organs that are part of gas change system in humans.

• lungs

• blood vessels

• capillaries

• diaphragm

• alveoli

How elephant seals can survive under water for long period of time?

• they can hold their breath for long time.

• they have an organ that stores blood full of oxygen.

• they have gills.

Which organ in the fish help them with gas exchange?

• lungs

• stomata

• gills

What is the role of stomata in plants?

• the exchange of gases

• to trap sunlight for photosynthesis

• to store water

Where stomata can be found in the plants?

• roots

• stem

• leaves

Which gas is taken in by the plants?

• oxygen

• carbon dioxide

• nitrogen

Which one of the following tests can detect respiration?

• rise in temperature around the cells

• solution of calcium hydroxide test

• using hydrogen carbonate indicator

• all the above

What happens when carbon dioxide passes through limewater?

• it turns cloudy

• it changes colour to yellow

• it becomes light pink

Give one example of a water-living mammal.