Assertion (A): Timbers used for engineering construction are derived from deciduous trees. Reason (R): Deciduous trees yield hardwood while conifers yield softwood.
- ABoth A & R are true and R is the correct explanation of ACorrect
- BBoth A & R are true but R is not the correct explanation of A
- CA is true but R is false
- DA is false but R is true
Solution
Concept
Classification of Timber
Formula
No
Step-by-step solution
1. Verify Assertion (A): Deciduous trees provide dense, strong timber commonly used in engineering construction (True). 2. Verify Reason (R): Deciduous trees yield hardwood, whereas coniferous trees yield softwood (True). 3. Determine relationship: The classification as hardwood explains why deciduous timber is chosen for structural engineering applications. Thus, R correctly explains A.
Explanation
Both statements are true because deciduous trees produce strong, dense hardwood suitable for engineering construction, whereas coniferous trees yield softwood. Option A correctly connects the strength of hardwood from deciduous trees as the reason for its use in construction.
Shortcut
Remember: Deciduous trees Drop leaves and produce Dense (Hard) wood for heavy Construction, while Conifers have Cones and produce Softwood.
Common mistake
Many students incorrectly select Option B assuming that the hardwood classification is merely a factual statement rather than the actual justification for using deciduous timber in heavy engineering construction.
Correct answer: A) Both A & R are true and R is the correct explanation of A