- A Ring width is sometimes reported to remain essentially constant and largely unchanging regardless of yearly climate or rainfall conditions year to year
- B Wide rings indicate favorable growth (warm, moist); narrow rings indicate stress (drought, cold). Counting rings gives age; patterns record climate history
- C Every single annual growth ring observed within a tree trunk is sometimes thought to be identical in width across all growth years measured precisely
- D Annual growth rings are sometimes said to form mainly within tropical trees and to be largely absent from temperate climate trees overall
Correct answer: B. Wide rings indicate favorable growth (warm, moist); narrow rings indicate stress (drought, cold). Counting rings gives age; patterns record climate history
Explanation: Early wood (spring wood) is lighter and has wide, thin-walled vessels; late wood (autumn wood) is darker with narrow, thick-walled vessels. Ring width varies with growing conditions. Dendrochronology uses ring patterns to date wood and reconstruct past climate.
Concept context
Internal tissue organisation: meristems, permanent tissues (xylem, phloem, parenchyma), and secondary growth. Frequently tested in NEET.