Question

A heap of green leaves is lying in one corner of a park. The green leaves in the heap burn with difficulty because: 

A. they contain a tough material called cellulose. 

B. they contain a lot of water. 

C. they contain a green pigment chlorophyll. 

D. they do not get sufficient oxygen for burning

Answer 1

B. they contain a lot of water. 

The green leaves contain a lot of water. This water does not allow the green leaves to get heated to their ignition temperature and makes burning of green leaves difficult.