Bacterial Diseases & Pathogenicity — NEET Biology

Correct answer: A — A-I-b, B-III-a, C-II-d, D-IV-c

This question requires matching bacterial groups with their characteristics and examples/habitats. A. Archaebacteria: 'live in some of the most harsh habitats such as hot springs... Archaebacteria differ from other bacteria in having a different cell wall structure and this feature is responsible for their survival in extreme conditions.' So, A matches I and b. (A-I-b) B. Cyanobacteria: 'have chlorophyll a similar to green plants and are photosynthetic autotrophs'. 'Some of these organisms can fix atmospheric nitrogen in specialised cells called heterocysts, e.g., Nostoc and Anabaena.' So, B matches III and a. (B-III-a) C. Mycoplasma: 'are organisms that completely lack a cell wall. They are the smallest living cells known... Many mycoplasma are pathogenic in animals and plants.' So, C matches II and d. (C-II-d) D. Heterotrophic Eubacteria: 'Heterotrophic bacteria are most abundant in nature. The majority are important decomposers. Many of them have a significant impact on human affairs... Some are pathogens causing damage to human beings... Cholera, typhoid, tetanus, citrus canker are well known diseases caused by different bacteria.' So, D matches IV and c. (D-IV-c) Combining these matches, the correct option is A.