[Campbell Biology P.711] A researcher discovers a new strain of Rhizopus stolonifer that pro... | Practice Question

A researcher discovers a new strain of Rhizopus stolonifer that produces zygosporangia that are unusually fragile and break easily. Under what conditions would this new strain most likely be disadvantaged compared to wild-type Rhizopus stolonifer , and why?

  • A: During periods of abundant moisture and nutrients, because asexual reproduction would be favored.
  • B: During extended periods of drought and nutrient scarcity, because the zygosporangium is critical for survival in harsh conditions.
  • C: When only one mating type is present in the environment, as sexual reproduction would be impossible for both strains.
  • D: During periods of rapid nutrient cycling, because it would outcompete other saprophytic fungi.

Explanation

The text explicitly states that the zygosporangium develops a rough, thick-walled coating that can resist harsh conditions for months. If the zygosporangia are unusually fragile, their ability to withstand adverse environmental conditions like drought and nutrient scarcity would be severely compromised, placing the new strain at a significant disadvantage compared to the wild type.