Ephedra and Gnetum are exceptions to gymnosperms as they show

Options

A. Double fertilization
B. Siphonogamy
C. Aggregation of sporophylls
D. Presence of ovules .

Answer

A

Explanation

In Gnetum gnemon, Charmichael and Friedman (1995) have reported that the two male gametes of a pollen tube fuse with different nuclei. In Ephedra one male gamete fuses with egg while other fuses with venter canal nucleus (Khan, 1943).