Question

Spirogyra differs from Mucor in having
A. Uninucleate gametangia
B. Multicellular gametes
C. Anisogamete
D. Sexual reproduction

Answer 1

Hint: Mucor is a filamentous fungus that exists in soil, plants, rotting fruits and vegetables. Mucor spp is not only ubiquitous in nature but also a common pollutant in the laboratory. They may cause infections to humans, frogs, amphibians, cattle and pigs.

Complete answer: Spirogyra is very common in relatively pure eutrophic waters and develops a slimy, filamentous green mass. In spring, Spirogyra grows underwater, but when there are enough sun and heat, they produce large amounts of oxygen and stick-like bubbles between tangled threads. The filamentous mass becomes visible as a slimy green mat. Spirogyra contains a cell wall, nucleus, pyrenoid, and spiral chloroplasts. The Mucor spores or sporangiospores can be simple or branched, and form a spherical sporangium at the top, which is supported and elevated by columnar columns. The shape and the lack of stems and rhizomes can distinguish the moulds of Mucor from the genus Abasia, Rhizobium and Rhizopus. Some Mucor species produce chlamydospores. The common black fungus Rhizopus and Mucor belong to Zygomycotina. Asexual spores cannot move. Sexual reproduction occurs through the complete fusion of two multinucleated gametangia to produce zygospore. Therefore, fungi from the Zygomycetes group are also known as conjugate fungi. So, spirogyra differs from Mucor in having Uninucleate gametangia. A gametangium is an organ or cell in which gametes are produced that is found in many multicellular protists, algae, fungi, and the gametophytes of plants. In contrast to gametogenesis in animals, a gametangium is a haploid structure and formation of gametes does not involve meiosis.
Thus, the correct answer is option A.

Note: The Zygomycota or zygote fungi is an earlier division or species of the fungi kingdom. Currently, its members are part of two fillets Mucoromycota and Zoopagomycota. About 1060 species are known. They are mostly terrestrial in habitats, living on soil or decaying plant or animal material.