Yeast and Raising agents

Question 1

What is Yeast?

Answer 1

Yeast is a micro-organism

Question 2

What does yeast need?

Answer 2

1.Food-it likes sugar
2.Moisture
3.Warmth-ideally 25-29 Degrees
4.Time

Question 3

What is yeast for?

Answer 3

1.It is a biological raising agent
2.Under the right conditions, it ferments and produces the gas carbon dioxide

Question 4

What else can yeast do?

Answer 4

Yeast can make food spoil by developing ‘off’ flavors and may appear ‘fizzy’

Question 5

What is yeast used in?

Answer 5

1.Bread doughs
2.Doughnuts
3.Buns
4.Croissants

Question 6

What are the three types of yeast?

Answer 6

1.Fresh yeast (blended with warm water and sugar before use)
2.Dried yeast (blended with warm water and sugar before use)
3.Fast-acting ‘easy blend’ dried yeast

Question 7

What is a raising agent?

Answer 7

A raising agent makes things rise. They work by introducing gas into a mixture.

Question 8

3 ways to get CO2 into food

Answer 8

1.Yeast
2.Baking powder
3.Bicarbonate of soda

Question 9

7 ways to get air into food

Answer 9

1.Whisk
2.Folding
3.Beat
4.Creaming
5.Rubbing in
6.Sieving
7.Steam

Question 10

Why do these methods work as raising agents?

Answer 10

When heated, gas expands and makes the mixture rise