Lichens grow at a very slow rate (1 mm per year). In how many years, a lichen matures?
1 - 4 years
4 - 8 years
100 years
20 - 25 years
A
20 - 25 years
B
1 - 4 years
C
4 - 8 years
D
100 years
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Solution
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Lichens usually reach maturity and produce ascocarps at 4-8 years of age. The age of some lichens in alpine-arctic area is 1000-4500 years. Their longevity can be partially attributed to their ability to survive long periods of drought unharmed.
Thus, the correct answer is option B.
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