Demethylation of lignin is a common side reaction 

Please select statements which are true about lignin.

Functional groups in lignin include 

Lignin fulfill several important roles in plants. Please identify two of them.

The three different lignin monomers are present in different concentrations in different biomass types. Please list which lignin monomer is predominant in softwood, what you would find in hardwoods and what would be present in non-woods (such as grass).

Failure plane in compression commonly trends at:

Dilatancy means:

Effective stress is preferred when pore pressure is relevant because:

Principal-stress form of MC for triaxial compression:

Geological Strength Index (GSI) is assigned from: