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A multicellular, filamentous alga exhibi...

A multicellular, filamentous alga exhibits a type of sexual life cycle in which the meiotic division occurs after the formation of zygote. The adult filament of this alga has

A

haploid vegetative cells and diploid gametangia

B

diploid vegetative cells and diploid gametangia

C

diploid vegetative cells and haploid gametangia

D

haploid vegetative cells and haploid gametangia

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the multicellular filamentous alga and its sexual life cycle, we will break down the information step by step. ### Step-by-Step Solution: 1. **Understanding the Life Cycle of Algae**: - Algae exhibit a life cycle that alternates between two stages: the haploid gametophytic stage and the diploid sporophytic stage. 2. **Identifying the Stages**: - The **gametophytic stage** is haploid (n), where gametes are produced. This stage is multicellular and is referred to as gametangia. - The **sporophytic stage** is diploid (2n), which develops from the zygote after fertilization. 3. **Formation of Zygote**: - When gametes fuse, they form a zygote, which is diploid. This zygote undergoes mitosis to develop into the sporophyte. 4. **Meiosis in the Sporophyte**: - The diploid sporophyte undergoes meiosis to produce haploid spores. These spores will eventually develop into new gametophytes. 5. **Characteristics of the Adult Filament**: - The adult filament of the alga, being part of the gametophytic stage, is multicellular and haploid. Therefore, it contains haploid vegetative cells and haploid gametangia. 6. **Conclusion**: - The adult filament of this alga has haploid vegetative cells and haploid gametangia. ### Final Answer: The adult filament of this alga has haploid vegetative cells and haploid gametangia.
To solve the question regarding the multicellular filamentous alga and its sexual life cycle, we will break down the information step by step. ### Step-by-Step Solution: 1. **Understanding the Life Cycle of Algae**: - Algae exhibit a life cycle that alternates between two stages: the haploid gametophytic stage and the diploid sporophytic stage. 2. **Identifying the Stages**: ...
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