Question

In Rhizopus, tubular thread-like structures bearing sporangia at their tips are called as
A.Filaments
B.Hyphae
C.Rhizoids
D.Roots

Answer 1

Hint:This belongs to the genus of saprophytic and parasitic fungi. They are usually seen in a moist and damp area. They are usually found on organic matter like fruits, vegetable jellies, bread, etc. Its vegetative structure is made up of coenocytic and branched hyphae. They produce various alcoholic and chemical products. Few species of Rhizopus cause diseases in plants and causes infection in humans known as mucormycosis.

Complete answer:Filaments- Like animals and plants, fungi are eukaryotes multicellular organisms. Fungi are composed of many filaments known as hyphae.
Hyphae- A hyphae has one or more cells and is surrounded by a tubular cell wall. In many fungi species, the hyphae are divided into cells by internal cross-walls called septa. The septa have pores that are large enough for mitochondria, ribosomes, and sometimes even nuclei to freely flow between cells.
Rhizoids- these are protuberance which means that they extend from lower epidermal cells of algae and bryophytes. They are the same as root hair and similar in functions as in vascular land plants. Some of these rhizoids are formed in some of the fungi. These may be unicellular or multicellular.
Roots- The roots of fungi are called mycorrhiza because these form a symbiotic relationship with the higher plants for their nutrients. These fungi form associations with algae and form lichens; these are the best-known examples of the symbiotic association. A large number of fungi infect the roots of the plants by forming an association with the plants.
Hence the correct answer is option B, Hyphae.

Note: In fungi, Hyphae are the filamentous structures that branch out and spread below the substratum surface like bread. In their life cycle, Hyphae may arise erect above the surface, and its tip forms a bulb-like structure. This bulb-like structure forms the sporangium. The spores are formed in the sporangia and it is a mode of asexual reproduction.