Factors Affecting Diffusion and Impact on Organisms

The video explores diffusion, focusing on factors affecting its rate: concentration gradient, temperature, and surface area. It explains the significance of surface area to volume ratio in organisms, highlighting differences between single-celled and multicellular organisms. The video also discusses specialized exchange surfaces in animals and plants, emphasizing adaptations for effective exchange, such as large surface areas, thin membranes, and efficient blood supply.

Which factor increases the rate of diffusion by providing more energy to particles?

• Membrane thickness

• Temperature

• Surface area

• Concentration gradient

What happens to the surface area to volume ratio as an object increases in size?

• It decreases

• It increases

• It remains constant

• It doubles

Why do single-celled organisms have an advantage in exchanging materials with their environment?

• They have more complex structures

• They have a larger surface area to volume ratio

• They have a smaller surface area to volume ratio

• They have multiple cell layers

What is a key feature of specialized exchange surfaces in multicellular organisms?

• Thick membranes

• Low surface area

• High temperature

• Efficient blood supply

Which structure in mammals provides a large surface area for nutrient absorption?

• Roots

• Gills

• Villi

• Alveoli

How do gills in fish maintain a concentration gradient?

• By pumping water over them

• By reducing surface area

• By increasing temperature

• By having thick membranes

What adaptation do leaves have to increase their surface area for gas exchange?

• Reduced surface area

• Multiple cell layers

• Flat and thin structure

• Thick layers