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Question

Which two groups of Gymnosperms are regarded as living fossil Gymnosperm?


A
Coniferales and Taxales
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B
Taxales and Gnetales
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C
Cycadales and Ginkgoales
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D
Cycadales and Coniferales
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Solution

The correct option is A Cycadales and Ginkgoales
Cycadales belong to the biological division, Cycadophyta along with the fossil order Medullosales. The three extant families of cycadales are Cycadacea, Strangeriacea, and Zamiacea. Though they are a minor component of plant kingdom today, during the Jurrasic period. they were extremely common. They have changed little since the Jurassic, compared to some major evolutionary changes in other plant divisions.
Ginkgoales is a plant order containing only one extant species: Ginkgo biloba, the ginkgo tree. It is monotypic (the only taxon) within the class Ginkgoopsida, which itself is monotypic within the division Ginkgophyta. The order includes five families, of which only Ginkgoaceae remains extant.


Biology

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