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Absence of dormant buds and absence of annual growth rings in a fossilized trunk specimen of a coal swamp plant indicates:
Question

Absence of dormant buds and absence of annual growth rings in a fossilized trunk specimen of a coal swamp plant indicates:

A.

Long dry seasons

B.

Slow growth rate

C.

Highly fluctuating seasons

D.

Unvarying, seasonless climate

Correct option is D

The absence of dormant buds and annual growth rings in a fossilized trunk suggests that the climate was relatively uniform throughout the year. This indicates a seasonless climate, where the plant did not need to enter a dormant state nor produce growth rings due to the absence of significant seasonal fluctuations. Such conditions are typical in tropical environments, where temperature and moisture levels remain stable.

Information Booster:

  1. The absence of dormant buds suggests that the plant did not experience long dry seasons or any need for dormancy during harsh conditions.

  2. Absence of growth rings indicates the lack of seasonal changes that typically stimulate the growth of new rings in woody plants.

  3. The plant was likely adapted to a stable climate, such as in tropical regions, where temperature and rainfall are consistent throughout the year.

  4. Highly fluctuating seasons (option 3) would typically result in the presence of dormant buds and annual growth rings, which is not the case here.

  5. Long dry seasons (option 1) and slow growth rate (option 2) would typically result in adaptations like dormancy or the formation of growth rings, but those features are missing in this case.

Additional Knowledge:

  • Fossils with no growth rings suggest that the climate was warm and wet year-round, where seasonal changes in temperature or water availability were minimal.

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