Q3 of 56 Page 170

Which is the first enzyme to mix with food in the digestive tract?

The first enzyme to mix with food in the digestive tract is amylase. It is secreted by the salivary gland and it acts on starch present in the food and breaks it down into smaller carbohydrate molecules.

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1

The opening and closing of the stomatal pore depends upon:

 2

Choose the forms in which most plants absorb nitrogen:

(i) Proteins


(ii) Nitrates and nitrites


(iii) Urea


(iv) Atmospheric nitrogen

 4

If salivary amylase is lacking in the saliva, which of the following events in the mouth cavity will be affected?

 5

The inner lining of stomach is protected by one of the followings from hydrochloric acid. Choose the correct one: