What are unilocular sporangia?
Unilocular sporangia are a type of sporangia produced by a brown algae, Ectocarpus. Unilocular sporangia consist of an enlarged, single cell, which undergoes meiosis to produce haploid zoospores. The unilocular sporangia develop from the terminal cells of the small branchlets. These zoospores are haploid.
What are sporangia in Pteridophytes?
In ferns, sporangia are typically found on the abaxial surface (underside) of the leaf and are densely aggregated into clusters called sori. Sori may be covered by a structure called an indusium. Some ferns have their sporangia scattered along reduced leaf segments or along (or just in from) the margin of the leaf.
What type of spores do unilocular sporangia produce?
3.8). Plurilocular sporangia, a multichambered sporangium, releases mitospores, which form the sporophyte. Alternatively, unilocular sporangium, a single-chambered structure, undergoes meiotic division and produces meiospores. Meiospores give rise to morphologically similar male or female gametophytes.
What type of sporangia is nephrolepis?
-In Nephrolepis, mixed sorus is present because without any order of development sporangia arise. That is why the sorus is of mixed type. -The irregular ripening of later sporangium takes place in mixed sorus among earlier ones and regarded as an advanced form of sorus.
Are sporangia present in the branches?
FUNGI | Overview of Classification of the Fungi Absidia – pear-shaped sporangia produced in partial whorls at intervals along stolon-like branches. Sporangiospores subglobose to ellipsoid. Branches produce rhizoids at intervals but not opposite the sporangiophores.
What is the function of the sporangium?
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.
Which type of stele is present in nephrolepis?
Transverse Section (T.S.) Epidermis is followed by cortex. Stele is primitive type of dictyostele. Two curved strands facing each other are present in the centre. Both strands are separated from each other and are surrounded by sclerenchyma.
Is pteris a Pteridophyte?
All spores are structurally and functionally alike; hence Pteris is a homosporous pteridophyte. Spores are triangular in shape with trilete aperture, bounded by two walls.