Question

Cellulose present in plants and as a food for cattle but not for human beings because

• 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 1

Answer: (A)

human body does not contain cellulase hence cellulose cannot be broken into $D$-glucose

Answer 2

The enzyme cellulase present in the stomach of catde 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.