AIIMS 201926 May
- Exam
- AIIMS
- Year
- 2019
- Date
- 26 May
- Subject
- Botany
- Chapter
- Anatomy of Flowering Plants
AIIMS 2019 · 26 May · Botany · Anatomy of Flowering Plants
Assertion : Annual rings are used to calculate the age of tree....
Assertion : Annual rings are used to calculate the age of tree.
Reason : Secondary growth is not found in bamboo.
Options
- AIf both assertion and reason are true and reason is the correct explanation of assertion.
- BIf both assertion and reason are true but reason is not the correct explanation of assertion.
- CIf assertion is true but reason is false.
- DIf both assertion and reason are false.
Correct answer
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
Step-by-step solution
Each year the tree forms new cells (secondary growth) arranged in concentric circles called annual rings. These rings show amount of wood produced during one growing season. By counting the annual rings, the age of a tree can be determined. This phenomenon is called dendrochronology. Only plants showing secondary growth show annual rings. Bamboo is a monocot and hence secondary growth is absent in bamboo.