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Oct 26, 2024 · Pollination Mechanism: Gymnosperms typically rely on wind pollination, whereas angiosperms often utilize insects, animals, and wind. Diversity: Gymnosperms are less diverse, with around 1,000 species, while angiosperms boast over 300,000 species. Characteristics of Gymnosperms. Gymnosperms possess several distinctive characteristics:
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. The term gymnosperm comes from the composite word in Greek: γυμνόσπερμος (γυμνός, gymnos, 'naked ...
- Gymnosperm Definition
- Examples of Gymnosperm
- Gymnosperm Life Cycle
- Related Biology Terms
- Quiz
Gymnosperms are a group of plants which produce seeds that are not contained within an ovary or fruit. The seeds are open to the air and are directly fertilized by pollination. “Gymnosperm”, from the Greek, gymnos, “naked” and sperma, “seed”, develop their seeds on the surface of scales and leaves, which often grow to form cone or stalk shapes, con...
Conifers
Conifers, in the division Pinophyta or Coniferophyta, are the most numerous of the gymnosperms; woody and with vascular tissue, these are cone bearing trees and shrubs. Conifers can be found growing in all parts of the world, although they most notably dominate the boreal forestsof the northern hemisphere. Many are adapted to cold climatic conditions, with downward facing branches, which help to shed snow, and specific biochemical properties that provide resistance to freezing. Examples of co...
Cycads
The appearance of the cycads (division Cycadophyta) typically constitutes a single, stout, cylindrical, woody trunk and a crown of large, hard and stiff, evergreen compound leaves, which grow directly from the trunk in a rosette formation. The cycads are dioecious, meaning that each individual plant is either all male or all female. The cycads are partly xerophyte, which means they are adapted to survive in areas with very little liquid water, although their distribution largely centers aroun...
Gnetophytes
The gnetophyta are distinguishable within the gymnosperms because they have vessel elements, a system of channels mostly found in the angiosperms, which transport water within the plant. Covering 70 species over three genera, the gnetophyta are morphologicallyvariable, including trees, shrubs, stumps, vines and creepers with leaf shapes ranging from opposite, to whorled, scale-like and straplike. The distribution is determined by the genus: Welwitschia are unique to the Namib Desert and surro...
Gymnosperms reproduce with an alteration of generations, meaning their reproductive cycle has both haploid and diploidphases. As in all other vascular plants, gymnosperms have a sporophyte dominant life cycle (the sporophyte is the diploid multicellular stage, which comprises the body of the plant, i.e., a leafy tree). The gametophytephase is relat...
Angiosperm– The term for the group of flowering plants which reproduce via seeds contained within ovules.Vascular Plants– A large group of plants defined as those which have tissues (xylem and phloem) for conducting minerals and water throughout the plant.Non-vascular Plants– The group of plants without the xylem and phloem vascular tissues, although they usually transport water through other mechanisms.1. For a plant species to be ‘dioecious’, it must: A. Reproduce asexually B. Have both male and female organs C. Have separate male and female individuals D.Not reproduce 2. Which division of the gymnosperms is most commonly used to create paper? A. Conifers B. Cycads C. Gnetophyta D.Gingkophyta 3. What role does the cone have in the gymnosperm lif...
May 2, 2018 · 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. Gymnosperms are vascular plants of the subkingdom Embyophyta and include conifers, cycads, ginkgoes, and gnetophytes.
- Regina Bailey
Gymnosperms are the first seed forming plant group i.e. First Spermatophytes. HABIT. Gymnosperms mostly produces tall or medium size trees while a few species are found as woody shrubs. HABITAT. Mostly found in temperate areas having high altitudes, some are found in tropical or sub-tropical regions. LIFE CYCLE. Shows Diplontic life cycle BODY ...
The life cycle of a gymnosperm involves alternation of generations, with a dominant sporophyte in which the female gametophyte resides, and reduced gametophytes. All gymnosperms are heterosporous. The male and female reproductive organs can form in cones or strobili.
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Among the numerous other gymnosperm species are many different reproductive processes. Some gymnosperms, for example, are dioecious, with microstrobili and megastrobili being borne on separate plants, as in junipers (Juniperus), plum yews (Cephalotaxus), yews (Taxus), and podocarps (Podocarpus).
