A substance that speeds up chemical reactions in your body is called a(n)
starch
sugar
enzyme
plasma
Q.3.
Which of the following is NOT a nutrient?
Fats
Water
Fiber
Vitamins
Q.4.
The enzyme in saliva that breaks down starches is:
Glycogen
Amylase
Pepsin
Actin
Q.5.
Which of the following does NOT take place in the mouth?
An enzyme is added to food
The teeth break food into smaller pieces.
Nutrients are absorbed into the bloodstream
Mechanical and chemical digestion begin
Q.6.
Hydrochloric acid is secreted in the _______________ .
oesophagus
stomach
large intestine
small intestine
Q.7.
Bile is a digestive juice in our body. Which of the following statements about bile is correct?
It is produced by the gall bladder.
It contains an enzyme that digests fat.
It helps break down fat into droplets.
It stimulates peristaltic movement of the small intestine.
Q.8.
The stomach wall produces mucus to cover its surface. Which of the following statements correctly describe(s) the function of the mucus?(It kills the bacteria in the ingested food.(It prevents the rubbing of food against the stomach wall.(It protects the stomach wall from the action of the digestive enzymes.
(1) only
(3) only
(1) and (2) only
(2) and (3) only
Q.9.
In the alimentary canal, most water is absorbed in the
oesophagus
stomach
small intestine
colon
Q.10.
In the alimentary canal, bacteria in food are mainly killed by
saliva
mucus
gastric juice
pancreatic juice
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