The age of a tree can be estimated by
Correct answer: A. Number of annual rings
- A. Number of annual rings
- B. Diameter of its heartwood
- C. Its height and girth
- D. Biomass
Explanation
(a): Two bands of secondary xylem i.e., autumn wood and spring wood are produced in one year. These two bands make an annual ring. The age of plant can be determined by counting the annual rings. It is called dendrochronolgy.
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About Support and Movement
Support and movement covers the axial and appendicular skeleton, bone structure, joints and the arrangement of skeletal muscles. Muscle contraction is explained through actin, myosin, sliding filaments, calcium ions and ATP, while arthritis is distinguished as a disorder of joints rather than a normal part of movement.
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