Gas Exchange | MCQs

Explanation

A respiratory surface, such as the alveoli in lungs or the surface of gills, possesses the following properties:

• Thin: allows for efficient gas exchange
• Wet: facilitates the exchange of gases between the surface and the surrounding environment
• Permeable: allows gases to pass through the surface
• Very large: provides a large surface area for gas exchange to occur

Explanation

The respiratory surface, where gas exchange occurs, is the alveoli.

Alveoli are tiny sacs located at the end of the bronchioles, deep in the lungs.

They provide a large surface area for the exchange of oxygen and carbon dioxide between the lungs and the bloodstream.

Explanation

Gaseous exchange refers to the exchange of gases between an organism and its environment.

Both photosynthesis and respiration involve gaseous exchange:

• Photosynthesis: takes in carbon dioxide (CO2) and releases oxygen (O2)
• Respiration: takes in oxygen (O2) and releases carbon dioxide (CO2)

Explanation

Guard cells regulate the opening and closing of stomata, controlling gas exchange and transpiration.

They surround the stomata and change shape in response to environmental conditions, opening or closing the stomata as needed.

Explanation

• Breathing (respiration) is a process that requires energy.
• But it does not release energy.

The characteristics of the breathing process are:

• It is a physical process.
• It occurs in the respiratory system.
• It requires energy.
• Enzymes are not involved.

Explanation

• Stomata are small openings on the surface of leaves that allow for gas exchange.
• Including the release of water vapor (transpiration) and the entry of carbon dioxide.
• This process is essential for photosynthesis and regulation of water balance in plants.