Solve MCQ on What is Potato Dextrose Agar (PDA)

Welcome to MCQ Quiz on Potato Dextrose Agar

Which component in Potato Dextrose Agar serves as the primary source of carbon?

A) Dextrose

B) Agar

C) Potato extract

D) Peptone

What is the primary purpose of using PDA in fungal cultivation?

A) To enhance bacterial growth

B) To provide a selective medium for fungi

C) To neutralize fungal spores

D) To inhibit bacterial enzymes

In preparing Potato Dextrose Agar, autoclaving at 121°C for 15 minutes ensures which of the following?

A) Sterility by eliminating fungal spores

B) Prevention of nutrient degradation

C) Inhibition of specific bacteria

D) Formation of agar gel structure

What role does agar play in Potato Dextrose Agar?

A) Provides nutrients for fungal growth

B) Acts as a pH stabilizer

C) Serves as a solidifying agent

D) Enhances dextrose utilization by fungi

What is the pH range generally maintained in PDA to favor fungal growth?

A) 3.5 - 4.5

B) 4.8 - 5.2

C) 6.0 - 7.0

D) 8.0 - 9.0

Potato Dextrose Agar is considered ideal for isolating which type of organisms due to its nutrient profile?

A) Thermophilic bacteria

B) Pathogenic yeasts

C) Fastidious anaerobes

D) Common molds and yeasts

Which modification to PDA can enhance its selectivity for fungi over bacteria?

A) Increasing dextrose concentration

B) Lowering the pH to 3.5

C) Adding gelatin

D) Reducing the agar concentration

How does the inclusion of potato extract in PDA specifically benefit fungal cultures?

A) Provides proteins necessary for growth

B) Acts as a growth inhibitor for bacteria

C) Supplies complex carbohydrates beneficial for fungi

D) Enhances the solidification of the medium

Which fungal species are commonly identified or isolated using Potato Dextrose Agar?

A) Escherichia coli and Bacillus subtilis

B) Aspergillus niger and Candida albicans

C) Lactobacillus species

D) Enhances the solidification of the medium

Why is Potato Dextrose Agar often supplemented with antibiotics like chloramphenicol in certain applications?

A) To increase fungal growth rate

B) To inhibit bacterial contamination

C) To change the medium's color upon contamination

D) To adjust the pH for yeast growth

Solve MCQ on What is Potato Dextrose Agar (PDA)

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