In which part of the digestive system does a chemical change of the food first occur? a. mouth b. esophagus c. stomach d. liver

The correct answer is Mouth.

The food is first broken down by the help of enzymes present in saliva. There are various kinds of enzymes present in saliva such as amylase which coverts starch into maltose and dextrin. This is further broken down in small intestine. Almost 30% of starch present in the food is digested by salivary amylase.This chemical change that is conversion of starch into maltose and dextrin first takes place in mouth.

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bad one: the problem with organic matter is that while plant nutrients are needed for crop growth, they can also stimulate excessive growth of the wrong plants – mainly, algae.

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