1.3.1 Diffusion And Living Organisms

Question 1

Adaptations for diffusion in the alveoli

Answer 1

Large surface area
Short diffusion path
Maintained steep concentration gradient
Moisture

Question 2

Adaptations for diffusion in Villi/Microvilli

Answer 2

-Microvilli increase surface area
-Short diffusion path- one cell thick
-Maintained concentration gradient(good blood supply)
- Mitochondria provide energy for active transport

Question 3

Adaptations for diffusion in in fish gills

Answer 3

• Large surface area from gill filaments
• Shirt diffusion path
• Maintained steep concentration gradient by good blood supply

Question 4

Adaptations for diffusion in plant leaves

Answer 4

• Air space in Sponge mesophyl to create a large surface area
• Thin leaves to reduce diffusion pathway
• Multiple leaves to increase surface area

Question 5

Adaptations for diffusion in plant roots

Answer 5

• Xylem remove water and minerals to maintain steep concentration gradient
• Short diffusion pathway as roots are thin
• Root hair cells increase surface area
• Mitochondria provide energy for active transport