Which type of food is NOT digested before being absorbed by the body?
A carbohydrate
B fat
C protein
D water
The diagram shows the human alimentary canal. In which structure is most glucose absorbed into the blood?
A
B
C
D
The diagram shows some of the organs of the human body. In which organs does the digestion of proteins take place?
A Organs P and Q
B Organs P and R
C Organs Q and R
D Organs Q and S
Which organ produces amylase?
A gall bladder
B liver
C oesophagus
D pancreas
The diagram shows a large food molecule changing into smaller molecules. What is process X?
A absorption
B chewing
C digestion
D secretion
The diagram shows part of the alimentary canal and associated organs. Which structures secrete enzymes that digest proteins?
A parts T and U
B parts U and V
C parts V and W
D parts W and T
The graph shows pH changes in the mouth after eating. Why is it a good idea to brush teeth after eating?
A Acidic conditions help bacteria to grow.
B Acids dissolve tooth enamel.
C Alkaline conditions help bacteria to grow.
D Alkalis dissolve tooth enamel.
The diagram shows a piece of small intestine during peristalsis. What is happening at X?
A circular muscles contracted; longitudinal muscles contracted.
B circular muscles contracted; longitudinal muscles relaxed.
C circular muscles relaxed; longitudinal muscles contracted.
D circular muscles relaxed; longitudinal muscles relaxed.
Poor nutrition can lead to a condition called rickets in which bones fail to develop properly. The table shows some minerals and vitamins present in four foods. Which food would be best for a child who has rickets?
Why does chewing food speed up digestion?
A Bacteria in the food are killed.
B Food is mixed with protease.
C The surface area of the food is increased.
D he taste of food is improved.
A person ate food X. Food X was not affected by enzymes until it reached the duodenum. What was in food X?
A fat
B mineral ion
D starch
The diagram shows the teeth of the lower jaw of a human. Which tooth is an incisor?
What is the function of the anus?
A assimilation
B digestion
C egestion
D excretion
The diagram shows the four types of human tooth. Which teeth are used for cutting rather than grinding food?
A 1 and 2
B 2 and 3
C 3 and 4
D 4 and 1
What is the result of a diet lacking iron?
A bleeding gums
B poor wound healing
C reduced number of red blood cells
D weak bones and teeth
A child decided to eat only meat, oily fish, cheese and bread, and drink only water. Which nutrient would be in low levels in this diet?
A calcium
B iron
C vitamin C
D vitamin D
A person has bleeding gums. This could be caused by a lack of which nutrient?
The table shows the main contents of four meals. Which meal will be the most effective at preventing constipation?
The activity of lipase is measured in four parts of the gut. Which part has the most lipase activity?
A colon
B duodenum
D stomach
Which type of tooth is used for crushing food?
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