Which of the following does not show regeneration ?
A. Mucor
B. Planaria
C. Sponges
D. Starfish
Answers
The correct answer is
Option (A) Mucor
Which of the following does not show regeneration ?
A. Mucor
B. Planaria
C. Sponges
D. Starfish
A. Mucor
Mucor mucedo (genus species) uses asexual reproduction. When erect hyphal sporangiophores are formed. The tip of the sporangiophore swells to form a globose sporangium that contains uninucleate, haploid sporangiospores. An extension of the sporangiophore called the columella protrudes into the sporangium. The sporangium walls are easily ruptured to release the spores, which germinate readily to form a new mycelium on appropriate substrates.
During sexual reproduction, compatible strains form short, specialized hyphae called gametangia. At the point where two complementary gametangia fuse, a thick-walled, spherical zygosporangium develops. The zygosporangium typically contains a single zygospore. Nuclear karyogamy and meiosis (sexual recombination) occur within the zygospores, which are thought to be long-lived and resistant to adverse conditions. They may germinate to form hyphae or a sporangium. Mucor includes both homothallic (self-compatible) and heterothallic species.