Q.79 Match the culture media to their uses
Culture Media                                  Uses
(i) Complex media                     (p) identifying certain bacteria from mixed culture
(ii) Selective media                    (q) chemically undefined media for growing bacteria
(iii) Differential media              (r) cultivating fastidious bacteria
(iv) Enriched media                   (s) distinguishing one bacteria from another
(A) (i)–(s), (ii)–(r), (iii)–(q), (iv)–(p)                  (B) (i)–(q), (ii)–(p), (iii)–(s), (iv)–(r)
(C) (i)–(q), (ii)–(r), (iii)–(p), (iv)–(s)                  (D) (i)–(p), (ii)–(s), (iii)–(q), (iv)–(r)

The correct answer is option (B): (i)-(q), (ii)-(p), (iii)-(s), (iv)-(r).​

Media Definitions

Complex media contain undefined ingredients like peptones, yeast extracts, and digests from plant or animal tissues, providing a broad range of nutrients for general bacterial growth. Selective media include inhibitors such as antibiotics, high salt, or dyes to allow growth of specific bacteria while suppressing others from mixed cultures. Differential media incorporate indicators that produce visible changes, like color shifts, to distinguish bacteria based on metabolic differences. Enriched media add blood, serum, or vitamins to basal media to support fastidious bacteria requiring extra growth factors.​

Matching Uses

• (i) Complex media matches (q) chemically undefined media for growing bacteria, as their variable composition supports diverse non-fastidious species.​

• (ii) Selective media matches (p) identifying certain bacteria from mixed culture, by inhibiting unwanted organisms for isolation.​

• (iii) Differential media matches (s) distinguishing one bacteria from another, through reactions like lactose fermentation on MacConkey agar.​

• (iv) Enriched media matches (r) cultivating fastidious bacteria, such as Neisseria on chocolate agar.​

Option Analysis

Option (A) (i)-(s), (ii)-(r), (iii)-(q), (iv)-(p) mismatches all: Complex media do not distinguish bacteria; selective media isolate rather than enrich; differential media are not undefined for growth; enriched media do not identify from mixtures.​

Option (B) (i)-(q), (ii)-(p), (iii)-(s), (iv)-(r) correctly pairs each term with its primary function based on standard microbiology classifications.​

Option (C) (i)-(q), (ii)-(r), (iii)-(p), (iv)-(s) errs on selective (not for fastidious), differential (not for identification from mixtures), and enriched (not for distinguishing).​

Option (D) (i)-(p), (ii)-(s), (iii)-(q), (iv)-(r) incorrectly assigns complex to identification, selective to distinguishing, and differential to undefined growth.​

Introduction to Culture Media Matching

Culture media matching questions test microbiology fundamentals, especially for CSIR NET Life Sciences, focusing on types like complex, selective, differential, and enriched media and their precise uses such as growing bacteria or identifying from mixed cultures. These media enable bacterial isolation, growth, and differentiation in labs. Understanding matches prevents errors in exams.​

Key Types and Uses Table

Exam Tips for Matching Questions

• Recall: Selective isolates (inhibitors), differential visualizes (indicators), enriched supplements nutrients.​

• Common traps: Confusing selective with differential or complex with enriched.​

• Practice: Link uses directly—e.g., mixed culture isolation is selective.​