Multiple choice

The zygospores are not generally formed in a culture of Rhizopus developed from a single spore because of

  1. lack of light

  2. shortage of oxygen

  3. absence of plus (+) and (-) strains of mycelium

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Rhizopus fungi are heterothallic, meaning they require two opposite mating strains (plus + and minus - strains) to undergo sexual reproduction and form zygospores. When you start a culture from a single spore, you only have one strain present. Without both plus and minus strains coming into contact, sexual reproduction cannot occur and zygospores cannot form. This is a fundamental characteristic of their reproductive biology.

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