Discussion
Which of the following fossil organs DOES NOT belong to pentoxylon plant ?
Answer: D
The organ that does not belong to Pentoxylon is Williamsonia.
The Jurassic plant Pentoxylon sahnii, described by Birbal Sahni from the Rajmahal Hills, has been reconstructed from separately named fossil organs: Pentoxylon (stem), Nipaniophyllum (leaf), Carnoconites (female, seed-bearing cone) and Sahnia (male, pollen-bearing organ).
Williamsonia is a reproductive structure of the Bennettitales (cycadeoids), a different group of Mesozoic gymnosperms whose plant is reconstructed with leaves such as Ptilophyllum. The other three options are all parts of Pentoxylon.
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