NEET BIOLOGY

Detailed explanation-1: -The Zygomycota are characterized by an asexual propagation based on aplanate mitospores – sporangiospores – of endogenous origin (Benjamin, 1979). The sporangiospores are formed within multispored sporangia or few-spored to single-spored sporangiola borne on branched or unbranched aerial sporangiophores.

Detailed explanation-2: -Zygospore (a thick-walled resting spore) produced in a zygosporangium after fusion of two gametangia.

Detailed explanation-3: -Usually the outermost layers of the zygosporangium wear away or disappear and the remaining body is called a zygospore. At an appropriate moment the zygospore may germinate to produce a new thallus or it may give rise to asexual spores via a sporangium.

Detailed explanation-4: -The walls between the gametangia of each fungus dissolve and the two fungi combine cytoplasm (plasmogamy) and then fuse the nuclei together (karyogamy) to form many diploid nuclei. As this happens, a thick, orange, ornamented wall forms around the nuclei. This is the zygosporangium.