127. Wood produced by plants of temperate region
a. Has variable density.
b. Is differentiated into lighter and darker regions.
c. Is similar in all aspects to that of tropical plants.
d. Is formed by differential activity of cambium.
(1) Only a and b are true
(2) Only a and d are true
(3) a, b and d are true
(4) b, c and d are true
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