1. There was major period of angiosperm diversification and radiation between 110 and 90 million years ago....

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Biology

1. There was major period of angiosperm diversification andradiation between 110 and 90
million years ago. For many years the dominant view was that thisreflected coevolution
with insects, which were also thought to have diversified duringthis period. This view is
now thought to be overly simplistic. Briefly outline evidence forand against this view,
and give an account of the various other processes that may havebeen involved.
2. \"Water in the xylem is under negative pressure, or tension\".Explain what this
statement means, how this physical situation comes about, what therisks are for plants
because of it, and describe some adaptations that help minimizethese risks or cope with
the consequences.

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The majority of environments are dominated by flowering plants today but it is uncertain how this dominance originated This increase in angiosperm diversity happened during the Cretaceous period and led to replacement and often extinction of gymnosperms and ferns We propose a scenario for the rise to dominance of the angiosperms from the Barremian to the Campanian based on the European megafossil plant record These megafossil data demonstrate that angiosperms migrated into new environments in three phases i Barremian freshwater lakerelated wetlands ii AptianAlbian ca 125100 Ma understory floodplains excluding levees and back swamps and iii CenomanianCampanian ca 10084 Ma natural See Answer

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