Week Quiz KDA 503/335: Timber, its origin and characteristics Introduction Most questions in this assessment require you to write an answer in a short paragraph Keep your answers concise They don't need to be longer than about 100 words Note that you can have more than attempt at the quiz and can take as long as you want Q&A Be concise Answers should be no more than 100 words Which of the cell types below are found in hardwoods but not in softwood? a parenchyma b tracheids c fibers d vessels e reactive Wood has four basic elemental components These and their proportion are: a Carbon 40%, oxygen 31%, hydrogen 17%, other 12% b Carbon 31%, oxygen 39%, hydrogen 7%, other 23% c Carbon 49%, oxygen 44%, hydrogen 6%, other 1% d Carbon 49%, oxygen 40%, hydrogen 7%, other 4% The three principal chemical components of the cell wall are: a Cellulose, , extractives, hemicellulose b Cellulose, hemicellulose, lignin c Hemicellulose, extractives, hydrogen d Carbon, hemicellulose, lignin Explain the differences between softwoods and hardwoods at a cellular level Discuss the effects of extractives in wood