The divergence of angiosperms from gymnosperms occurred between 200 and 250 million years ago. The woody tissues of angiosperms are also more complex and specialized. Angiosperms are of a much more varied type than gymnosperms. Here, the pollen grain germinates, and a pollen tube grows down the style until it meets the female gametophyte. Male strobili of conifers tend to produce far. All Gymnosperms are wind pollinated so they tend to produce more pollen. The male and female gametophyte structures are present on separate male and female cones in gymnosperms, whereas in angiosperms, they are a part of the flower. Therefore, angiosperms are considered to be more advanced plant group than gymnosperms.The main difference between Angiosperm and Gymnosperm is that the diversity of angiosperms is greater than that of the gymnosperms; this indicates the high adaptability of angiosperm to terrestrial ecosystems.

Angiosperms form flowers and therefore fruit. Insect-pollinated plants (which are almost all in the angiosperm camp) need less pollen than wind-pollinated plants, because insects fly directly from flower to flower while the wind blows pollen in all directions at random. Therefore, they generate microspores, which will generate pollen grains as the male gametophytes, and megaspores, which will form an ovule that contains female gametophytes. Pinus is a very good example. Gymnosperms hold an advantage in this tradeoff, growing cavitation-resistant wood at a lower cost of mechanical strength than angiosperms. Angiosperm - Angiosperm - Distribution and abundance: The diversity of form within the angiosperms has contributed to their successful colonization of more habitats than any other group of land plants.

The angiosperm vs gymnosperm difference comes down to how these plants reproduce. During pollination, pollen grains are physically transferred between plants from the pollen cone to the ovule. Fibers are more expensive per unit volume than tracheids and may also be involved in protecting vessel strength, factors that make angiosperm wood inherently more expensive. This fixed the position of Gymnosperms as a class distinct from Dicotyledons, and the term Angiosperm then gradually came to be accepted as the suitable designation for the whole of the flowering plants other than Gymnosperms, including the classes of Dicotyledons and Monocotyledons. The typical structure of flowering plants consisting of ovary, style, and stigma is absent in gymnosperms, is an important aspect of angiosperms.

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