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Sep 25, 2024 · Gymnosperms are wind-pollinated and have non-motile sperm, while angiosperms can be pollinated by animals or wind and have motile sperm. Gymnosperms disperse seeds through wind, while angiosperms have various dispersal methods like animals, wind, gravity, and explosive mechanisms.
A division of gymnosperms with one living species, Ginkgo biloba, a tree with fan-shaped leaves, and separate sexes. gnetophyte Group of gymnosperms that includes Ephedra, Gnetum and Welwitschia
In contrast, all seed plants, or spermatophytes, are heterosporous, forming two types of spores: megaspores (female) and microspores (male). Megaspores develop into female gametophytes that produce eggs, and microspores mature into male gametophytes that generate sperm.
Jan 18, 2024 · Extant groups of gymnosperms include the conifers, cycads (similar in appearance to palms), gnetophytes, and single species from the ginkgophytes, Ginkgo biloba. Of the approximately 1000 species of gymnosperms alive today, about 600 of these are conifers, 58 of which are found in California.
All gymnosperms are heterosporous. The male and female reproductive organs can form in cones or strobili. Male and female sporangia are produced either on the same plant, described as monoecious (“one home” or bisexual), or on separate plants, referred to as dioecious (“two homes” or unisexual) plants.
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Oct 14, 2024 · In all living gymnosperm groups, the visible part of the plant body (i.e., the growing stem and branches) represents the sporophyte, or asexual, generation, rather than the gametophyte, or sexual, generation. Typically, a sporophyte has a stem with roots and leaves and bears the reproductive structures.
