Understanding the Digestive System

What is the primary purpose of digestion in living organisms?

• To produce waste

• To convert food into energy and growth

• To store food

• To eliminate toxins

Which organ is responsible for starting the digestion process?

• Stomach

• Oesophagus

• Mouth

• Large intestine

What role does saliva play in digestion?

• It eliminates waste

• It absorbs nutrients

• It helps break down food

• It stores food

Where does the absorption of nutrients primarily occur?

• Mouth

• Stomach

• Small intestine

• Large intestine

What happens to substances like plant fibers during digestion?

• They are broken down into energy

• They are absorbed as nutrients

• They are stored in the stomach

• They pass into the large intestine as waste

Which of the following is NOT needed for the digestive system model experiment?

• A potato masher

• A small banana

• A piece of bread

• A glass of milk

In the model experiment, what does the zip-seal bag represent?

• The stomach

• The mouth

• The large intestine

• The small intestine

What does the orange juice represent in the model experiment?

• Digestive enzymes

• Stomach acid

• Nutrients

• Saliva

What is the purpose of the tights in the model experiment?

• To represent the large intestine

• To represent the oesophagus

• To represent the stomach

• To represent the small intestine

What does the liquid oozing out of the tights represent?

• Waste products

• Nutrients absorbed by the body

• Saliva

• Stomach acid