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Multiple Choice
Which of the following statements about fungi is/are true?
A
The dominant stage of the life cycle is usually haploid.
B
The haploid nuclei of dikaryotic hyphal cells fuse to form a diploid zygote.
C
Many species obtain their nutrients from decaying organic matter.
D
Spores germinate and then mitotically divide to form a mycelium.
E
All of the listed responses are correct.
Verified step by step guidance
1
Understand the life cycle of fungi: Fungi typically have a life cycle that includes both haploid and diploid stages. The dominant stage is usually haploid, where the organism spends most of its life cycle.
Examine the dikaryotic stage: In many fungi, particularly in the phylum Basidiomycota and Ascomycota, the hyphae can exist in a dikaryotic state, where two haploid nuclei coexist in the same cell. These nuclei eventually fuse to form a diploid zygote, which is a key step in sexual reproduction.
Consider the nutritional habits of fungi: Many fungi are saprophytic, meaning they obtain nutrients by decomposing dead organic matter. This is a crucial ecological role as it helps in nutrient cycling.
Explore spore germination and mycelium formation: Fungal spores are typically haploid and, upon germination, undergo mitotic division to form a network of hyphae known as a mycelium. This is the vegetative part of the fungus.
Review the statements: Each statement provided aligns with the general characteristics and life cycle of fungi. Therefore, all the listed responses are correct, as they accurately describe aspects of fungal biology.