1. The table below shows four classes of timber defects

Seasoning	Decay	Growth	Insect Attack

Copy the table and use it to classify the following timber defects:

check                                      split
knot                                         wet rot
dry rot                                     borers
wane                                       warp
case hardening                     sharp

            (b)       (i)         List the two main classifications of plastics.
(ii)        Explain the difference between the two classes of plastics listed in 3(b)(i).