Mycology MCQs (Quiz 18) Posted on July 9, 2026Author agropublishers 0 1. The first phase of a typical microbial growth curve is the _________________ Log phase Lag phase Death phase Stationary phase 2. A basidium typically produces _______ basidiospores One Four Three Two 3. Unlike animal viruses, the vast majority of plant viruses ______________ Lack lipid envelope Have double protein coats Possess a lipid envelope Replicate in mitochondria 4. Crown gall disease in plants is caused by bacterium __________________ _________________ Agrobacterium tumefaciens Erwinia amylovora Pseudomonas syringae Xanthomonas campestris 5. Basidiospores differ from ascospores because they are produced __________________________ Externally on basidia Internally within asci Both externally on basidia and internally within asci Neither externally nor internally 6. During the lag phase, microorganisms mainly ______________________ Form endospores Produce secondary metabolites Undergo exponential multiplication Adapt to the new environment and synthesize enzymes 7. Plant viruses exhibit which of the following types of morphology? Variable in morphology Rod-shaped only Spherical only Flexuous filamentous 8. The primary characteristic of the lag phase of microorganisms is _________________________ Active metabolic activity with little or no cell division Rapid cell division Spore formation Maximum cell death 9. _________ is characteristic of Tobacco mosaic virus (TMV) Helical symmetry Cubical symmetry Icosahedral symmetry Bilateral symmetry 10. An ascus typically contains _______ ascospores Sixteen Two Four Eight Loading … Question 1 of 10
