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Question
The zygospore in Rhizopus develops into
The zygospore in Rhizopus develops into
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Solution
The correct option is B Promycelium
In Rhizopus, the male (+) and female (-) gametangia fuse and the gametangial copulation leads to the formation of a zygospore. It contains many pairs of nuclei. Some of these pairs of nuclei fuse to produce diploid nuclei, while others degenerate. The young zygospore enlarges and probably secretes five layered (two in exospore and three in endospore) thick wall, which undergoes a period of rest. 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. Meiosis occurs during zygospore germination and the haploid nuclei form haploid spores like sporangiospores inside the sporangium.
Thus, the correct answer is option B.
In Rhizopus, the male (+) and female (-) gametangia fuse and the gametangial copulation leads to the formation of a zygospore. It contains many pairs of nuclei. Some of these pairs of nuclei fuse to produce diploid nuclei, while others degenerate. The young zygospore enlarges and probably secretes five layered (two in exospore and three in endospore) thick wall, which undergoes a period of rest. 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. Meiosis occurs during zygospore germination and the haploid nuclei form haploid spores like sporangiospores inside the sporangium.
Thus, the correct answer is option B.
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