Chemical Digestion

Which of the following(s) is/are the features for mechanical digestion?

(Could be more than 1 answer)

• The breaking down of food into smaller pieces

• The breaking down of food by mechanical action

• No new substances are formed during mechanical digestions

• Enzyme is needed in mechanical digestions

Saliva contains ______________

• digestive enzyme

• acid

• bile

• sugar

Starch could be tested by adding _________

• iodine

• iodine solution

• DCPIP solution

• Starch test paper

What is/are the features for chemical digestion?

(Hints : Could be more than 1 answer)

• The breaking down of complex insoluble substances in food into simple and soluble substances.

• New substances are formed in the chemical digestion

• Enzyme is formed as one of the new substances in the chemical digestion

• Chewing food by teeth is an example of chemical digestion

What is/are the properties of enzyme?

(Hints: Could be more than 1 answer)

• increase the rate of chemical reaction without being consumed in the reaction

• Enzyme has a sweet taste

• their action is sensitive to temperature

• Enzyme works best at 100 °C