Separation by filtration – True or false

The video explains how the nose filters out larger particles like dirt and dust using hairs and mucus, while allowing smaller gas molecules such as oxygen to pass through.

What role do the hairs and mucus in your nose play?

• They moisturize the air.

• They enhance the sense of smell.

• They filter out larger particles like dirt and dust.

• They help in breathing.

Which of the following is NOT filtered by the nose's hairs and mucus?

• Pollen

• Oxygen

• Dust

• Dirt

What characteristic allows gas molecules like oxygen to pass through the nose's filtration system?

• Their color

• Their small size

• Their weight

• Their large size

Which of the following is a gas molecule that can pass through the nose's filtration system?

• Oxygen

• Hydrogen

• Nitrogen

• Carbon

Why can't larger particles pass through the nose's filtration system?

• They dissolve in mucus.

• They are trapped by hairs and mucus.

• They are repelled by the nose.

• They are too heavy.