Which statements about diffusion are correct? 1 Diffusion is the net movement of particles from a higher to a lower concentration. 2 Diffusion is the net movement of particles only across cell membranes. 3 Diffusion requires energy from respiration.

1, 2 and 3

1 and 2 only

1 only

2 and 3 only

Biology

IGCSE&ALevel

CAIE

Exam No：0610_w24_qp_13 Year：2024 Question No：8

Answer:

Knowledge points:

3.1.1 Define diffusion as the net movement of particles from a region of their higher concentration to a region of their lower concentration down a concentration gradient, as a result of their random movement

3.1.2 Describe the importance of diffusion of gases and solutes

3.1.3 State that substances move into and out of cells by diffusion through the cell membrane

3.1.4 State that the energy for diffusion comes from the kinetic energy of random movement of molecules and ions

3.1.5 Investigate the factors that influence diffusion, limited to surface area, temperature, concentration gradients and distance

Which statements about diffusion are correct? 1 Diffusion is the net movement of particles from a higher to a lower concentration. 2 Diffusion is the net movement of particles only across cell membranes. 3 Diffusion requires energy from respiration.

Answer:

Knowledge points:

Solution:

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