Test Review: Digestive System & More

Which of these is NOT an example of a chemical change?

• Rusting

• Evaporating

• Tarnishing

• A precipitate forms

Tags

NGSS.MS-PS1-2

Which of these is an example of chemical energy being transformed into mechanical energy?

• Plants are fertilized and growing

• Water turns a mill wheel and grinds corn

• The breakfast you eat gives you energy to run in gym class

• Wood is burned at a campfire

Two colorless gases react to form a brown gas. Which of these provides evidence that a chemical reaction has occurred?

• A gas is formed.

• No new substance is formed.

• The state of matter remains the same.

• A brown gas is produced from 2 colorless gases.

Tags

NGSS.MS-PS1-2

All of these are examples of forces at work in the digestive system EXCEPT

• The stomach muscles contracting and churning up food.

• The smooth muscle in the esophagus pushing food from the throat to the stomach.

• The anus pushing waste from the body.

• Cardiac muscle pumping blood throughout the body.

Which of these is NOT a function of the digestive system?

• breaking down food

• delivering nutrients to the cells

• absorption of nutrients

• elimination of wastes

Which of the digestive structures in the table can cause a chemical change to occur?

• Teeth

• Tongue

• Esophagus

• Stomach

Tags

NGSS.MS-PS1-2

Where do physical changes occur in your digestive system?

• mouth

• mouth, stomach and large intestine

• mouth, stomach and small intestine

• mouth, esophagus and stomach

What chemical digestion action occurs in the mouth?

• Saliva mixes with food to make it wet.

• Enzymes break down large molecules of starch into sugars.

• The tongue shapes the food into a ball.

• Teeth chop, tear, and grind the food in the mouth.

Enzymes breaking large molecules into smaller molecules is a physical change?

• True

• False

Thermal energy is one of the forms of energy resulting from digestion which gets energy from food in the form of -

• mechanical energy

• chemical energy

• light energy

• radiant energy