Multiple choice Several fine roots-like hyphae that penetrate into the substrate are called _______. mycelia mucors sporangia rhizoids Reveal answer Fill a bubble to check yourself D Correct answer Explanation Rhizoids are specialized hyphae that grow downward into the substrate to anchor the fungus and absorb nutrients, similar to roots in plants. Mycelia refers to the entire network of hyphae, not just the root-like ones.