Cellulose in the form of plants is a food for cattles and sheeps but not for human beings. Explain.

Options

A. human body does not contain cellulase hence cellulose cannot be broken into D-glucose
B. human saliva cannot break down plant cellulose in small pieces
C. bile juice present in cattle helps them to digest cellulose
D. human beings have a smaller stomach than cattle.

Answer

A

Explanation

The enzyme cellulose present in the stomach of cattle breaks cellulose into D-glucose and is easily digested . But, it is not present in the human body hence cellulose cannot be broken down into D-glucose in human body and cannot act as food for human beings.