18 Questions
Why can single-celled organisms rely on diffusion for transporting molecules into their body?
They have a large surface area to volume ratio.
Why do multicellular organisms need adaptations for molecule transport instead of relying on diffusion alone?
They have a small surface area to volume ratio.
In the lungs, where does the transfer of oxygen and carbon dioxide take place?
In the alveoli
What structures in the small intestine aid in the absorption of digested food?
Villi
Why do fish gills have a large surface area?
To facilitate gas exchange
Which organ in plants has a high surface area to volume ratio for efficient gas exchange?
Leaves
Why do fish gills contain lamellae?
To increase the surface area
What role do alveoli play in the lungs?
Increase surface area for gas exchange
What is the function of villi in the small intestine?
Increase surface area for nutrient absorption
Why is a partially permeable membrane essential for osmosis?
To allow the movement of water based on concentration gradients
How do leaves increase the surface area for gas exchange?
By having a flattened shape and air spaces
What maintains a steep concentration gradient in fish for oxygen diffusion?
Water and blood flow in opposite directions
Why do fish have gill lamellae?
To increase the surface area for diffusion of oxygen into the blood and carbon dioxide into the water
How do guard cells in plant leaves affect stomata?
By changing the size of stomata based on the plant's water intake
What is the main function of alveoli in the lungs?
To provide a large surface area for gaseous exchange
Why do roots have root hair cells with large surface areas?
To increase absorption of water and mineral ions from the soil
What is the role of villi in the small intestine?
To increase the surface area for absorption of nutrients into the bloodstream
Why do gill filaments in fish have gill lamellae?
To enhance gas exchange by providing a larger surface area for diffusion
This quiz covers the relationship between surface area and absorption efficiency in various organisms and organs. Topics include the adaptations for efficient absorption such as lamellae, flattened shapes, air spaces, thin membranes, and efficient blood supply.
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