Science 8 | Biology | Unit 2. Food and digestion Digestion and absorption

Choose the correct answer.
A protein that is capable of speeding up a chemical reaction
saliva
enzyme
amylase
amino acid
Giải thích
The correct answer
enzyme
amylase
saliva
amino acid
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Fill in the blank.
As it passes along the canal, tiny food particles are able to get out of the canal and into the body. This is called
.
Đáp án
As it passes along the canal, tiny food particles are able to get out of the canal and into the body. This is called
absorption
.
Giải thích

The correct answer
absorption
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Match the options with the correct functions.
Absorption
Digestion
Molecules
the tiniest particle of a substance that can exist.
the breakdown of large molecules into small ones, so that they can be absorbed.
the food inside the alimentary canal can only reach your body cells if it can get out through the walls of the tube.

Giải thích
The correct answer

Absorption
Digestion
Molecules
the tiniest particle of a substance that can exist.
the breakdown of large molecules into small ones, so that they can be absorbed.
the food inside the alimentary canal can only reach your body cells if it can get out through the walls of the tube.

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Fill in the gaps in sentences below.

larger
larger
cannot
cannot
can
can
smaller
smaller
Molecules of protein, starch and fat are so big that they
get through the walls of the alimentary canal. So, in order to get these nutrients to your cells, the big molecules have to be broken down into much
ones. Then the small molecules can be absorbed. This is what digestion is. Digestion is the breakdown of large molecules into small ones, so that they can be absorbed.

Giải thích

The correct answer

Molecules of protein, starch and fat are so big that they
cannot
get through the walls of the alimentary canal. So, in order to get these nutrients to your cells, the big molecules have to be broken down into much
smaller
ones. Then the small molecules can be absorbed. This is what digestion is. Digestion is the breakdown of large molecules into small ones, so that they can be absorbed.

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Fill in the blank.
The other end of the tube is called the
.
Đáp án
The other end of the tube is called the
anus
.
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The correct answer
anus
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The following sentences are TRUE (T) or FALSE (F)?

	True	False
Nutrients cannot be used by body cells until they have been absorbed through the walls of the alimentary canal.
Both large and small molecules can pass through the wall of the alimentary canal.

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The correct answer

	True	False
Nutrients cannot be used by body cells until they have been absorbed through the walls of the alimentary canal.
Both large and small molecules can pass through the wall of the alimentary canal.

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Fill in the blank.
Your mouth is the entrance to a long tube called the
.
Đáp án
Your mouth is the entrance to a long tube called the
alimentary canal
.
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The correct answer
alimentary canal
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