Question

Columella is the specialized structure found in the sporangium of
A. Ulothrix
B. Rhizopus
C. Spirogyra
D. None of the above

Answer 1

Columella is a non-reproductive part that supports or holds the sporangium of some species of fungi. It can be present as branched or unbranched structures.

Complete step by step answer: Columella are predominantly present in fungal species such as Rhizopus commonly called as the bread mould. It is present as an apophysis or better known as a swollen structure. The main function of the part is to provide support to the sporangia, that has asexual spores. It also functions as a connecting link in the exchange of nutrients between the protoplasm underneath and the developing spores, thus benefiting its survival. While taking the other given options into consideration:
A. Ulothrix - It belongs to the genus of non-branching filamentous green algae that reproduces by means of vegetative measures. They are often considered as microorganisms.
B. Spirogyra - It is a filamentous green alga that has an aquatic habitat. These organisms mainly reproduce by means of fragmentation.
Hence, the correct answer is option B.

Note: Rhizopus is saprophytic fungi which thrive on plants. They are also found on animals but mainly as parasites, They normally live on decaying or dead plants. It belongs to the fungal class of zygomycetes. They reproduce by means of formation of both asexual and sexual spores. Asexual reproduction is by means of sporangiospores, which on germination produces a zygospore. This fungus called Rhizopus has its applications in food industries in the production of food and beverages.