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12th Grade Plant Fossils Quizzes , Questions & Answers

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Petrified Wood Quiz: Silicification, Wood Chemistry, and Fossil Forests

This assessment explores the fascinating process of silicification in petrified wood, including its chemical composition and significance in fossil forests. It evaluates your understanding of wood chemistry and the geological...

Questions: 15 | Attempts: 11 | Last updated: Mar 24, 2026

Sample Question 1
What is petrified wood and what chemical process produces it?

Wood that has been preserved by freezing in permafrost, maintaining original cell walls intact through ice crystal formation

Wood in which the original organic cell wall material has been replaced molecule by molecule with silica or other minerals through a process called permineralization or petrifaction

Wood that has been compressed and carbonized under burial pressure, producing a flat two-dimensional impression of the original log

Wood that has been naturally mummified by desiccation in arid environments, retaining dry but chemically unaltered organic tissue

Sample Question 2
Silicification of wood can preserve anatomical detail at the cellular level, including individual cell wall structure and growth ring boundaries visible to the naked eye or under microscopy.

True

False

Sample Question 3
What is the primary source of silica that drives the silicification of buried wood in most major petrified wood deposits?

Silica released by the biological weathering of granite bedrock by acid-secreting root systems of living trees

Silica precipitated from evaporating seawater during tidal flooding events that periodically inundated the burial site

Silica crystals mechanically ground from quartz grains by burial compaction and transported in suspension

Silica dissolved from volcanic ash deposits buried in the same sedimentary sequence as the wood, released as silicic acid into groundwater

12th Grade Plant Fossils Quizzes , Questions & Answers

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