Question

Which of the following grows on the surface of the medium when Aspergillus niger is inoculated?

(a) Slime layer

(b) Mycelium layer

(c) Foam layer

(d) Capsule

The question was asked in an interview for job.

Origin of the question is Commercial Applications in division Commercial Applications of Fermentation of Fermentation Technology

Answer 1

Right option is (b) Mycelium layer

The explanation is: When Aspergillus niger is allowed to grow on the surface of the liquid medium in surface culture fermentation, a layer of mycelium grows on the surface of the medium. It appears as a mycelial mat which is thick and floating over the medium.