yeast

Everyday

1. Yeast is a tiny living thing, a kind of fungus, used to make bread rise and to make beer. tree →
2. Yeast is the powder or block of these organisms that people buy for baking. tree →

In the lessons

In science lessons pupils feed yeast with sugar and warm water and watch it make bubbles of gas (carbon dioxide). In cooking, yeast makes bread dough rise. Phrases: dried yeast, fresh yeast, yeast extract (spreads like Marmite and Vegemite).

Examples

• Add yeast to the dough to make it rise. tree →
• Yeast is a living thing. tree →
• Yeast feeds on sugar and makes gas bubbles. tree →
• Warm water helps the yeast work. tree →
• Vegemite is made from yeast extract. tree →
• The balloon on the bottle filled with gas from the yeast. tree →
• A packet of yeast makes two loaves. tree →
• Too hot water can kill yeast. tree →

Note

Mostly uncountable. Pronounced YEEST. Yeast is a fungus, not a plant or an animal. Trap: baking powder makes cakes rise without being alive; yeast is alive.