Question

Sporangia of eusporangiate ferns
(a)Possess a single layer of wall cells
(b)Produce very few spores
(c)Originate from a group of initial cells
(d)Dehiscence at the region of a wall defined stomium

Answer 1

Hint: Vascular spore plants, whose sporangia originate from multiple epidermal cells, are Eusporangiate ferns. They contain specialized ring-shaped cells for spore release. Up to 7000 spores are produced by the Christensenia fern per sporangium. A periclinal wall, containing an outer and inner daughter cell, separates a superficial cell.

Complete answer:
There is a large sporangium in Eusporangiate ferns that grows from many initial cells that contain several spores. The sporangium fuses in certain instances to form Synangium. E.g., Selaginella and Psilotum. These ferns usually have reduced root systems and sporangia that contain large quantities of spores. E.g., Psilotum, Equisetum, etc.
The sporangia are thin-walled and an area of cells with thick inner walls and thin outer walls, causes dehiscence, generally in a ring called the annulus.

Additional Information: An annulus on the sporangium is an arc or a ring of specialized cells. These cells are grouped in one row and are associated with spore release or dispersal.
Leptosporangiate has a small sporangium and it grows from a single initial cell. They are capable of producing a small, definite number of spores (Less than 128).
So, the correct answer is, ‘Originate from a group of initial cells’.

Note: -A sporangium (the plural form is known as sporangia) is the capsule structure of many plants and fungi that produces and stores reproductive spores. Via meiosis, most sporangia create haploid spores, although some can develop spores via mitosis.
-Both land plants undergo an alteration to replicate over centuries. The sporangium is held by the sporophyte.