What are examples of spore bearing plants?
What are examples of spore bearing plants?
Spores are most conspicuous in the non-seed-bearing plants, including liverworts, hornworts, mosses, and ferns. In these lower plants, as in fungi, the spores function much like seeds.
What is a spore bearing leaf?
A leaf that bears sporangia (spore-producing structures) is called as sporophyll. They vary greatly in structure. In ferns, the sporophylls are the normal foliage leaves, produce clusters of sporangia, known as sori.
What is sporophyll give example?
A sporophyll is a leaf that bears sporangia. Both microphylls and megaphylls can be sporophylls. Cycads produce strobili, both pollen-producing and seed-producing, that are composed of sporophylls. Ginkgo produces microsporophylls aggregated into a pollen strobilus.
What are sporangia in ferns?
Each sporangium is a capsule that contains spores. They are usually aggregated into clusters called sori. The position and arrangement of the sporangia are very important for the identification of ferns. Fronds that have sporangia on their underside are fertile, and those that don’t are sterile.
Which of the following spore is formed in sporangia?
Sporangiospores. The asexual propagules that form inside a sporangium, which can be mostly spherical or cylindrical, through a process involving cleavage of the cytoplasm are named sporangiospores. These spores are thin walled, one celled, hyaline, or pale in color, and usually globose or ellipsoid in shape.
What is the meaning of sporangia in science?
Definition of sporangium : a structure within which spores are produced.
How do you identify sporangia?
A sporangium can be globose to obovoid or flask- or dumbbell-shaped to somewhat cylindrical in a few taxa. Its outer wall can be smooth, have terminal spines, or be covered with calcium oxalate crystals or spines, and at maturity it can deliquesce, persist, or become evanescent, depending on the species.
What are the leaves that bear sporangia called?
Leaves that bear sporangia are called sporophylls. If the plant is heterosporous, the sporangia-bearing leaves are distinguished as either microsporophylls or megasporophylls. In seed plants, sporangia are typically located within strobili or flowers.
Where are sporangia found in a seed plant?
In seed plants, sporangia are typically located within strobili or flowers. Cycads form their microsporangia on microsporophylls which are aggregated into strobili. Megasporangia are formed into ovules, which are borne on megasporophylls, which are aggregated into strobili on separate plants (all cycads are dioecious).
What is the meaning of sporangium?
Sporangium Definition. A sporangium (plural: sporangia) is the capsule structure belonging to many plants and fungi, in which the reproductive spores are produced and stored. All land plants undergo an alteration of generations to reproduce; the sporangium is borne upon the sporophyte, which is the asexual second generation structure.
How many spores are produced per sporangium in mosses?
…number of spores produced per sporangium ranges from 16 or 32 in some pteridophytes to more than 65 million in some mosses. The sporangia may be borne in specialized structures, such as sori in ferns or as cones (strobili) in many other pteridophytes. The leaflike structures that bear sporangia are…
