Question:
Annual rings in the woody dicot stem
Annual rings in the woody dicot stem
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Annual rings are widest at the base and gradually decrease in diameter towards the apex, reflecting the pattern of secondary growth in dicot stems.
Updated On: Jun 19, 2026
- Decrease towards top of the woody dicot stem
- Increase towards top of the woody dicot stem
- Remains constant in the woody dicot stem
- Decrease towards base of the dicot stem
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The Correct Option is A
Solution and Explanation
Step 1: Understanding annual rings.
Annual rings (or growth rings) are concentric rings in the secondary xylem of woody dicot stems formed due to seasonal variations in growth rate.
- In temperate regions, they result from differences in the size of xylem vessels formed during spring (larger vessels) and summer/fall (smaller vessels).
Step 2: Variation along stem height.
- At the base of the stem, the diameter of annual rings is larger due to more active cambial activity.
- As we move toward the top, the diameter of rings decreases because the cambium becomes less active and less xylem is produced.
Step 3: Conclusion.
Hence, annual rings decrease in size towards the top of the woody dicot stem.
Annual rings (or growth rings) are concentric rings in the secondary xylem of woody dicot stems formed due to seasonal variations in growth rate.
- In temperate regions, they result from differences in the size of xylem vessels formed during spring (larger vessels) and summer/fall (smaller vessels).
Step 2: Variation along stem height.
- At the base of the stem, the diameter of annual rings is larger due to more active cambial activity.
- As we move toward the top, the diameter of rings decreases because the cambium becomes less active and less xylem is produced.
Step 3: Conclusion.
Hence, annual rings decrease in size towards the top of the woody dicot stem.
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