question_answer

Which organism forms perithecia in its life cycle?

A)  Colletotrichum                

B)  Pyricularia

C)  Helminthosporium

D)  Sphaerotheca

Correct Answer: A

Solution :

                 Perithecium (ascocarp) is flask-shaped and duply sunk in cavities or locules in the cortical area of the stroma. It has a definite apical pore, ostiole through which the ascospores escape. It is common in class ascomycetes (including Aspergillus, Sphaerothea etc.) -Calletotrichum is included in class euteromycetes (fungi imperfecti). Sexual reproduction is absent here. Fig.  : (A-B) Ascomycetes. A. Entire Perithecium ; B. V. S. perethecium showing structure.