Sporangium is

• A. A leaf-like structure for photosynthesis
• B. A hardened shell around a spore
• C. A reservoir for spores in fungi
• D. A large sac-like structure where sporangiospores are formed

Answer: (D)

Sporangium is a large sac-like structure in fungi where sporangiospores are formed by mitotic division inside. It typically sits at the end of a sporangiophore, and when mature it releases the spores for dispersal. This definition distinguishes it from a leaf-like organ used for photosynthesis or from a hardened shell around a spore; those describe different structures, not the sporangial sac. The correct description emphasizes that the sporangium’s role is to house and produce sporangiospores within a sac.