‘Rind gall’ of sapwood is characterized by
- Alongitudinal cracks normal to annular rings
- Bswelling caused by growth of layers over wounds after the branch has been cut off in an irregular mannerCorrect
- Cwood with twisted fibers
- Ddiscoloration
Solution
Concept
Natural defects of timber
Step-by-step solution
1. A rind gall is a defect formed when a branch is cut or broken off. 2. The tree grows new layers over the wound irregularly, giving a swelling (a curved, uneven growth) on the surface.
Explanation
Rind galls are curved swellings caused by the growth of layers of wood over the wounds left after a branch has been cut off improperly. They are natural defects that weaken the timber locally.
Why the other options are wrong
Longitudinal cracks normal to the annual rings are radial shakes. Twisted fibres are spiral grain, and discoloration is a separate defect (stain).
Shortcut
Rind gall = swelling over a wound.
Common mistake
Confusing it with shakes (cracks).
Correct answer: B) swelling caused by growth of layers over wounds after the branch has been cut off in an irregular manner