Gymnosperm - Wikipedia
网页The gymnosperms (/ ˈdʒɪmnəˌspɜːrmz, - noʊ -/ ⓘ JIM-nə-spurmz, -noh-; lit. 'revealed seeds') are a group of seed-producing plants that include conifers, cycads, Ginkgo, and gnetophytes, forming the clade Gymnospermae.
Gymnosperm | Definition, Description, Plants, Examples, …
网页2024年8月31日 · Gymnosperm, any vascular plant that reproduces by means of an exposed seed, or ovule—unlike angiosperms, or flowering plants, whose seeds are enclosed by mature ovaries, or fruits. The seeds of many gymnosperms (literally ‘naked seeds’) are borne in cones and are not visible until maturity.
Gymnosperms: Definition, Examples, and Reproduction
网页2018年5月2日 · Gymnosperms are flowerless plants that produce cones and seeds. The term gymnosperm literally means "naked seed," as gymnosperm seeds are not encased within an ovary. Rather, they sit exposed on the surface of leaf-like structures called bracts.
14.3 Seed Plants: Gymnosperms - Concepts of Biology - OpenStax
网页Discuss the type of seeds produced by gymnosperms, as well as other characteristics of gymnosperms; List the four groups of modern-day gymnosperms and provide examples of each
26.2A: Characteristics of Gymnosperms - Biology LibreTexts
网页2023年10月31日 · Gymnosperms are seed plants adapted to life on land; thus, they are autotrophic, photosynthetic organisms that tend to conserve water. They have a vascular system (used for the transportation of water and nutrients) that includes roots, xylem, and phloem.
Seed Plants: Gymnosperms – Introductory Biology: Evolutionary …
网页Gymnosperms (“naked seed”) are a diverse group of seed plants and are paraphyletic. Paraphyletic groups do not include descendants of a single common ancestor. Gymnosperm characteristics include naked seeds, separate female and male gametes, pollination by wind, and tracheids, which transport water and solutes in the vascular system.
Seed - Gymnosperm, Embryo, Structure | Britannica
网页2024年8月30日 · Seed - Gymnosperm, Embryo, Structure: In gymnosperms (plants with “naked seeds”—such as conifers, cycads, and ginkgo), the ovules are not enclosed in an ovary but lie exposed on leaflike structures, the megasporophylls.
5.6.3: Gymnosperms - Biology LibreTexts
网页Characteristics of the gymnosperms include naked seeds, separate female and male gametophytes, pollen cones and ovulate cones, pollination by wind and insects, and tracheids (which transport water and solutes in the vascular system).
26.2: Gymnosperms - Biology LibreTexts
网页Gymnosperms are heterosporous seed plants that produce naked seeds. They appeared in the Paleozoic period and were the dominant plant life during the Mesozoic. Modern-day gymnosperms belong to four phyla. The largest phylum, Coniferophyta, is represented by conifers, the predominant plants at high altitude and latitude.
8.5 Seed Plants: Gymnosperms – VCU BIOL 152: Introduction to …
网页Gymnosperm seeds are not enclosed in an ovary like seeds of Angiosperms; rather, they are exposed on cones or modified leaves. These cones are composed of specialized …