water

Why is it generally advised not to drink tap water directly?

• It often contains too much chlorine.

• It can be too cold and upset your stomach.

• It may contain unseen harmful microorganisms.

• It is usually not filtered enough for direct consumption.

Are you enjoying the video lesson?

• Yes

• No

What scientific instrument is necessary to observe the tiny organisms present in water?

• A telescope

• A magnifying glass

• A microscope

• Binoculars

Based on the sizes mentioned in the video, which of these microorganisms is the largest?

• E. coli

• Blue-green algae

• Virus

• Paramecium

If lined up head-to-tail, how many E. coli bacteria can fit into a single drop of water?

• 33

• 2500

• 5000

• 33000