Evolutionary history of plants seed model is shared by basically all gymnosperms (literally: "naked seeds"), most of which encase their seeds in a woody cone or fleshy aril (the yew, for example), but none of which fully enclose their seeds. The angiosperms ("vessel seeds") are the only group to fully enclose the seed, in a carpel. Fully enclosed seeds opened up a new pathway for plants to follow: that of seed dormancy. The embryo, completely isolated from the external atmosphere and hence protected from desiccation, could survive some years of drought before germinating. Gymnosperm seeds from the Late Carboniferous have been found to contain
The Seeds of Doom The Seeds of Doom The Seeds of Doom is the sixth and final serial of the 13th season of the British science fiction television series "Doctor Who", which was first broadcast in six weekly parts on BBC1 from 31 January to 6 March 1976. The serial is set in Antarctica and England. In the serial, the plant collector Harrison Chase (Tony Beckley) seeks to retrieve a malignant alien plant called a Krynoid for himself. In Antarctica, British scientists Charles Winlett and Derek Moberley discover a pod buried in the permafrost and take it back to their camp. John Stevenson, the