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B
Promycelium
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C
Progamentangium
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D
Zygosporangium
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Solution
The correct option is D Promycelium
In Rhizopus, the male (+) and female (-) gametangia fuse and the gametangial copulation leads to the formation of a zygospore.
On germination, the innermost layer comes out after cracking the outer walls and produces a promycelium. With further development, the promycelium is differentiated into a lower stalk-like sporangiophore and an upper spherical sporangium. Hence, the Zygospore of Rhizopus develops into Promycelium.