Comparison of Gymnosperm with Angiosperms

Gymnosperms and angiosperms are grouped together as the seed plants (spermatophytes) because they share several important features: both have a well-organised plant body differentiated into root, stem and leaves; both possess vascular cambium (as dicotyledons do); the flower-like structure of Gnetum closely resembles an angiosperm's male flower, and in both groups the zygote is the first cell of the new sporophyte; both surround the ovule with a protective integument; both produce true seeds; both use a pollen tube to deliver the male nucleus; and both possess a eustele. …