Question

In fern, spores are formed in
A. Sporangium
B. Oogonium
C. Archegonium
D. Stomium

Answer 1

Hint: The non-flowering vascular plants such as ferns reproduce asexually. They contain sporangium. The sporophyte helps in the formation of spores. Ferns are also called homosporous plants. Oogonium is the female reproductive part that contains oospheres.

Complete answer:
In fern, there are two distinct stages in the life cycle. The spores are formed on the underside of the leaves. After the germination, the plants grow into small heart-shaped plants as prothali. The development of male and female cells begins on the plants and after fertilization the adult fern begins to develop.
Option A- Sporangium is the structure present in certain plants and fungi in which spores are developed. It is the capsule-like structure in which reproductive spores are produced and stored. The formation of sporangium occurs from sporophyte. It is the asexual second generation structure.
Option B- Oogonium is the female sex organ that contains one or more oospheres. It is found in certain algae and fungi. It is located in the ovarian cortex.
Option C- Archegonium is the female sex organ of the bryophytes, lower vascular plants such as ferns and also some gymnosperms. It produces female gametes.
Option D- Stomium are the thin walled cells in a sporangium or pollen sac. It breaks and releases the spores or pollen grains when the surrounding tissue dries.
From the above information we have found that in ferns, spores are formed in sporangium.

Hence, the correct answer is option (A).

Note: The plants included in the group of Pteridophytes are sporophytes. The sporangium formed from the sporophyte may be quite complex morphologically. The aggregated sporangia are called sori. Approx 64 spores are produced in each sporangia of ferns. The size and function of the spores is the same. Ferns are also called homosporous plants.