Q.

In Rhizopus, tubular thread like structures bearing sporangia at their tips are called :

1 Filaments  
2 Rhizoids  
3 Roots  
4 Hyphae  

Ans.

(4)

In fungi, hyphae are filamentous structures that branch out and spread beneath a substratum’s surface. Hyphae may rise upright above the surface during its life cycle, with its contents forming a bulge at the tip. The sporangium is formed by this bulge. Spores are generated in the sporangium.