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The zygospore of Spirogyra produces-
- a)2-zoospores
- b)4-zoospores
- c)2-4 zoospores
- d)None of these
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
The zygospore of Spirogyra produces-a)2-zoosporesb)4-zoosporesc)2-4 zo...
In Spirogyra, the sexual reproduction involves a cycle alternation between a haploid vegetative filament (gametophyte plant) and a diploid zygospore, towards the end of growing season the Spirogyra filament produce aplanogametes in vegetative cells called gametangia The gametes fuse to form a zygospore (2n).
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The zygospore of Spirogyra produces-a)2-zoosporesb)4-zoosporesc)2-4 zo...
Explanation:
Spirogyra is a filamentous green algae that reproduces sexually by the formation of a zygospore. The zygospore is a resting spore that is formed by the fusion of gametes from two different mating strains.
Zoospores:
Zoospores are motile spores that possess flagella for movement. In Spirogyra, the zygospore does not directly produce zoospores. Instead, the zygospore undergoes germination to form a new filament of Spirogyra.
Germination of Zygospore:
During germination, the zygospore undergoes meiosis to produce haploid cells. These cells then divide by mitosis to form a new filament of Spirogyra. The new filament will grow and develop into a mature thallus, capable of asexual reproduction through fragmentation.
Conclusion:
In conclusion, the zygospore of Spirogyra does not produce zoospores. Instead, it undergoes germination to form a new filament of Spirogyra.
Community Answer
The zygospore of Spirogyra produces-a)2-zoosporesb)4-zoosporesc)2-4 zo...
Zygospore is the only diploid phase in the sexual life cycle of Spirogyra. The decay of female gametangia causes the liberation of zygospore which remains dormant in the pond bottom till the favorable conditions return.
On return of favourable condition the diploid nucleus of zygospore undergo meiosis to produce 4 haploid nuclei out of which 3 degenerate. The zygospore with one haploid nucleus gradually enlarges and burst open to release a germ tube. The repeated transverse divisions of germ tube form a new filament.
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The zygospore of Spirogyra produces-a)2-zoosporesb)4-zoosporesc)2-4 zoosporesd)None of theseCorrect answer is option 'D'. Can you explain this answer?
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