how do yeast make bread grow and what other ingridients can make bread grow?

Question

my hw...

thx for answerin!!!

Answer 1

The process of getting a dough to rise is called "leavening".
Below is the joy of baking website and should be pretty helpful on your homework.

What gives bread it's structure is gluten found in wheat.
When the flour is wetted, the gluten becomes "active" and responds to mixing by forming longer chains and clumping together.

After the bread is kneaded, you can think of it as a a fine cell structure like the cells of a plant.

Yeast is a fungus that eats the sugars in the flour and the by-product of yeast is alcohol and carbon dioxide. The carbon dioxide is the important part of the bread leavening since that's what causes the dough to rise (puff up) since the gas is trapped in the dough.

Other ingredients that help bread rise is baking powder and baking soda. Those two ingredients produce carbon dioxide through a chemical reaction of an acid-base reaction. You've probably seen that when you put vinegar onto baking soda.
Breads made with baking powder or baking soda are called Quick Breads... An example of a quick bread is buttermilk bisquits or banana nut bread.

Another form of leavening is steam. Instead of carbon dioxide causing the bread to rise... An example of this type of bread is a popover (yorkshire pudding).

Basically there are three forms of leavening - yeast, chemical (baking powder, baking soda) and steam.

Answer 2

I don't know how yeast makes bread rise, but I know that baking powder will also make bread rise.

Answer 3

yeast is like a bacteria and when it's in a hot environment (like in the oven), it reproduces itself and that is why it makes bread grow