Name:
Worksheet
Digestion and enzymes
Task A: Mechanical and chemical digestion
1)
Write definitions for mechanical and chemical digestion and give an
example of each.
2)
Complete the sentences using some of these words.
bile
grind
saliva
digest
process
The mouth contains __________ to chemically digest food.
The teeth __________ food to digest it mechanically.
Task B: From large molecules to small
1)
Jun and Sofia are discussing how large molecules are broken down into smaller
molecules, but they have made some mistakes.
Rewrite their sentences correctly, keeping the word in bold unchanged.
Carbohydrates are
broken down into
amino acids.
Jun
Many amino acids
are joined together
to make lipids like
starch.
Sofia
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Digestion and enzymes
Worksheet
Task C: Chemical digestion by enzymes
1)
Complete the gap fill to define an enzyme.
An enzyme is a __________ which __________ the rate of a reaction.
2)
Draw a diagram to show how enzymes work.
3)
Complete the table to show which enzyme works on which type of food.
type of food
carbohydrates
enzyme
example
starch to sugar
proteins
lipids (fats)
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