Question

Zygospore is formed from
A. Gametangial copulation
B. Nuclear fusion
C. Zygote
D. Oogamy

Answer 1

The term Zygospore is usually defined as a thick walled resting cell of certain fungi and algae which arises from the fusion of two similar gametes. These kinds of spores are mainly found in that of fungi.

Complete Answer:
- Zygospores are defined as thick-walled resting cells found in members of fungi like Rhizopus. This gametangial copulation generally responds 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.
- Whenever the process of maturation is complete it secretes a five-layered thick wall. When germination is complete, the innermost layer emerges by cracking the outer walls and gives rise to a promycelium.

Now let us find the correct answer:
- Gametangial copulation: Gametangial copulation is defined as the fusion of the entire contents of two contacting gametangia. In gametangial copulation, male and female gametes come in close contact with each other and get fused.
- Nuclear fusion: The word nucleus means haploid number of chromosomes which is capable of fusing with a gamete of the opposite sex to produce a zygote. nuclear fusion is defined as fusion of nuclei. It is a mode of asexual reproduction.
- Zygote: Zygote usually termed as a cell that starts the process of forming an infant or animal by the fusion of male and female gametes. it produces blastomeres; later the single cells gradually become subdivided into smaller cells.
- Oogamy: Oogamy is a type of sexual reproduction in which the larger gamete is the egg and it is motile whereas the other gamete is small and motile.

Hence the correct answer is option A.

Note: Zygospore are mostly present in mucor, a kind of fungi. Zygospores constitute a characteristic feature of the zygomycete fungi which are generally thick walled and darkly coloured. When the fusion of the two haploid cells it leads to formation of zygospores in Zygosporangia.