Answer
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Hint: Zygospore are essentially found in the members of kingdom fungi. It is a type of sexual reproduction in fungi. These structures are formed by gametangial fusion.
Complete answer:Zygospores are thick-walled resting cells found in members of fungi like Rhizopus. This gametangial copulation ultimately leads to the formation of a zygospore. It is a multinucleated structure.
Some of the pairs of nuclei fuse with each other and this results in the formation of diploid nuclei, while the remaining one's degenerate.
The young zygospore gradually enlarges and matures. Once maturation is complete it secretes a five-layered thick wall.
Upon germination, the innermost layer emerges by cracking the outer walls and gives rise to a promycelium.
With gradual growth, the promycelium undergoes differentiation and changes to become a lower stalk-like sporangiophore and an upper spherical sporangium.
Zygospore germination is characterized by the occurrence of meiosis and the resulting haploid nuclei form haploid spores like sporangiospores within the sporangium.
So, the correct answer is option B. Promycelium.
Note: In Rhizopus, the male (represented by +) and female (represented by -) gametangia undergo fusion. It is noteworthy that zygospore is often mistaken for zoospores. Zygospores are sexual spores whereas zoospores are asexually produced.
Complete answer:Zygospores are thick-walled resting cells found in members of fungi like Rhizopus. This gametangial copulation ultimately leads to the formation of a zygospore. It is a multinucleated structure.
Some of the pairs of nuclei fuse with each other and this results in the formation of diploid nuclei, while the remaining one's degenerate.
The young zygospore gradually enlarges and matures. Once maturation is complete it secretes a five-layered thick wall.
Upon germination, the innermost layer emerges by cracking the outer walls and gives rise to a promycelium.
With gradual growth, the promycelium undergoes differentiation and changes to become a lower stalk-like sporangiophore and an upper spherical sporangium.
Zygospore germination is characterized by the occurrence of meiosis and the resulting haploid nuclei form haploid spores like sporangiospores within the sporangium.
So, the correct answer is option B. Promycelium.
Note: In Rhizopus, the male (represented by +) and female (represented by -) gametangia undergo fusion. It is noteworthy that zygospore is often mistaken for zoospores. Zygospores are sexual spores whereas zoospores are asexually produced.