What is the thread-like structure in Rhizopus?

Correct option is B

Correct option: (b) , Hyphae

The thread-like structure in Rhizopus is called a hypha.

• ​Rhizopus is a type of fungus (often referred to as black bread mold) that grows in the form of a network of these thread-like structures. The hyphae form the main body of the fungus and are collectively referred to as the mycelium.
  
• These hyphae spread out in the substrate, absorb nutrients, and can produce reproductive structures like sporangia, which contain spores.

So, the hyphae are the thread-like structures in Rhizopus responsible for growth and nutrient absorption.