IGCSE Diffusion

Identify the type of energy that gives molecules their random movement

• Heat

• Light

• Chemical

• Kinetic

State the term that describes molecules been evenly spread out in an area

Fill in the missing word - 'Diffusion is the ......... movement of molecules down from a region of high concentration to a region of low concentration'

Identify the structures that give the small intestine a very large surface area

• Alveoli

• Gillis

• Cilia

• Villi

Which structure surrounds all cells and controls what can enter and leave the cell?

• Cell membrane

• Cell wall

• Cytoplasm

• Mitochondria

Cells need to use energy for diffusion to occur

• True

• False

Fill in the missing word: 'Molecules move by diffusion down a concentration ..............'

Which structure is used for gas exchange in fish?

Identify the word that describes the cell membrane as a structure through which molecules can pass

• Rigid

• Permeable

• Fluid

• Impermeable

Identify the structures in the lungs that give it a very large surface area for gas exchange

• Villi

• Alveoli

• Gills

• Air spaces