What statement differentiates septate from aseptate hyphae?

What statement differentiates septate from aseptate hyphae?

• A. Septate hyphae have crosswalls; aseptate hyphae lack crosswalls
• B. Septate hyphae lack crosswalls; aseptate hyphae have crosswalls
• C. Aseptate hyphae have crosswalls
• D. Aseptate hyphae are not found in fungi

Answer: (A)

The key idea is how fungal hyphae are partitioned along their length. Septate hyphae have crosswalls, called septa, that divide the filament into individual cells. Aseptate hyphae lack these crosswalls, forming a continuous cytoplasmic mass with many nuclei. That distinction is exactly what the statement is getting at: septate hyphae possess crosswalls, while aseptate hyphae do not. The crosswalls in septate hyphae often have pores that allow movement of cytoplasm and organelles between compartments, balancing internal transport with compartmentalization. Why the other options don’t fit: if septate hyphae lacked crosswalls, that would misstate their fundamental structure; if aseptate hyphae had crosswalls, that would also contradict their defining, continuous-cytoplasm condition. And saying aseptate hyphae aren’t found in fungi is incorrect, since many fungi display coenocytic (aseptate) hyphae.

The key idea is how fungal hyphae are partitioned along their length. Septate hyphae have crosswalls, called septa, that divide the filament into individual cells. Aseptate hyphae lack these crosswalls, forming a continuous cytoplasmic mass with many nuclei.

That distinction is exactly what the statement is getting at: septate hyphae possess crosswalls, while aseptate hyphae do not. The crosswalls in septate hyphae often have pores that allow movement of cytoplasm and organelles between compartments, balancing internal transport with compartmentalization.

Why the other options don’t fit: if septate hyphae lacked crosswalls, that would misstate their fundamental structure; if aseptate hyphae had crosswalls, that would also contradict their defining, continuous-cytoplasm condition. And saying aseptate hyphae aren’t found in fungi is incorrect, since many fungi display coenocytic (aseptate) hyphae.