Do land plants have archegonia?
Archegonia of most land plants share a common developmental motif, here termed a T-shaped pattern. A primary axial cell produces a primary cover cell and a central cell by horizontal division.Oct 19, 2020
Do plants have archegonium?
archegonium, the female reproductive organ in ferns and mosses. An archegonium also occurs in some gymnosperms, e.g., cycads and conifers. A flask-shaped structure, it consists of a neck, with one or more layers of cells, and a swollen base—the venter—which contains the egg.
Do plants have archegonia?
Archegonium (sing.) or archegonia (plu.) are structures borne on the gametophytes of plants that bear ovum or female gamete. The male counterpart of an archegonium is the antheridium.
Do vascular plants have archegonium?
Like the nonvascular plants, the seedless vascular plants have a free-living gametophyte generation that forms antheridia and archegonia, in which gametes are produced.
Which does not have an archegonia?
Archegonia are female sex organs in bryophytes (first land plants), pteridophytes (vascular cryptogams) and gymnosperms (non flowering plants). Archegonia are absent in flowering plants.
Which of the following does not have archegonium?
Detailed Solution. The correct answer is Thallophytes.
Do ferns have archegonia?
archegonium, the female reproductive organ in ferns and mosses. An archegonium also occurs in some gymnosperms, e.g., cycads and conifers.
In which gymnosperm archegonia are absent?
In angiosperms, archegonia and antheridia are absent. So, the correct answer is option D, angiosperms. Note: The archegonia are absent in some higher gymnosperms like Gnetum, Ephedra and Welwitschia etc.
Do all plants have antheridia and archegonia?
Antheridium and archegonium are reproductive organs in nonflowering plants such as ferns, mosses, and other nonflowering plants. The antheridium is the male gametophyte and produces sperm cells (male gametes). The antheridium will produce numerous sperm for fertilization.Mar 10, 2022
Do ferns have archegonia and antheridia?
The ferns and fern allies germinate from spores. These plants are mostly homosporous - their spores are identical and you can't differentiate which will grow into male or female plants. They are also monoecious - both the archegonia and antheridia (male and female reproductive structures) are borne on the same plant.