Microbial Ecology (GATE)
Microbial Ecology - covers microbial metabolism, environmental preferences (pH, temperature, salinity), classification, and habitats
Questions
Which of the following is not an obligate anaerobe?
- Clostridium
- Eubacterium
- Lactobacillus
- Peptostreptococcus
- Succinovibrio
Which of the following is a purple non-sulphur bacterium?
- Nitrosomonas
- Chloroflexus
- Nitrobacter
- Rhodospirillum
- None of these
Which of the following is a pair of aerobic sulphur-oxidising bacteria?
- Chlorobium and Chromatium
- Achromatium and Chromatium
- Chromatium and Thiobacillus
- Achromatium and Thiobacillus
- Chlorobium and Thiobacillus
Which of the following is a set of acidophiles?
- Sulfolobus, Lactobacillus, Aspergillus
- Pseudomonas, Euglena, Paramecium
- Sulfolobus, Euglena, Lactobacillus
- Sulfolobus, Lactobacillus, Aspergillus
- Euglena, Lactobacillus, Pseudomonas
Members of genus _________ are strictly aerobic.
- Clostridium
- Lactobacillus
- Actinomyces
- Helicobacter
- Moraxella
Which of the following is a set of neutrophiles only?
- Alicyclobacillus, Ferroplasma and Sulfolobus
- Escherichia, Euglena and Paramecium
- Sulfolobus, Escherichia and Euglena
- Euglena, Natronobacterium and Paramecium
- Alicyclobacillus, Escherichia and Paramecium
Members of which of the following phyla of algae are colourless?
- Rhodophyta
- Chlorophyta
- Bacillariophyta
- Dinoflagellata
- Oomycota
Match the columns:
| Column I | Column II |
| P. Selenomonas | 1. Microaerotolerant anaerobe |
| Q. Salmonella | 2. Obligate anaerobe |
| R. Propionibacterium | 3. Facultative anaerobe |
| S. Helicobacter | 4. Aerotolerant anaerobe |
- P - 1; Q - 2; R - 3; S - 4
- P - 1; Q - 3; R - 2; S - 4
- P - 2; Q - 1; R - 4; S - 3
- P - 2; Q - 3; R - 4; S - 1
- P - 3; Q - 2; R - 1; S - 4
Which of the following microbes requires high salt concentration for its growth?
- Pryidictium
- Sulfolobus
- Halobacterium
- Deinococcus
- Thermus
Which of the following matchings is incorrect?
- Chocolate agar: Gram-negative enteric bacteria
- MacConkey agar: Gram-negative bacteria
- Sabouraud agar: Yeast, mould and bacteria that grow in acidic conditions
- Potato dextrose agar: Yeast and mould from food
- Endo agar: Coliform bacteria
Which of the following is an example of oxygenic photosynthesising bacteria?
- Anabaena
- Chloroflexus
- Chlorobium
- Rhodospirillum
- Proteobacteria
All of the following are common non-pathogenic Amoebida genera of freshwater habitats, except
- Amoeba
- Echinamoeba
- Saccamoeba
- Entamoeba
- Trichamoeba
Match the columns:
| Column I | Column II |
| P. Thermophiles | 1. 10–50oC |
| Q. Mesophiles | 2. 40–72oC |
| R. Psychrophiles | 3. 0–30oC |
| S. Psychrotrophs | 4. -8–19oC |
- P - 1; Q - 2; R - 3; S - 4
- P - 2; Q - 3; R - 4; S - 1
- P - 3; Q - 2; R - 1; S - 4
- P - 2; Q - 1; R - 4; S - 3
- P - 4; Q - 2; R - 3; S - 1
Match the columns
| Column I | Column II |
| P. Candida albicans | 1. Scalp |
| Q. Corynebacterium acnes | 2. Sebum-rich areas of the face |
| R. Haemophilus species | 3. Oropharynx |
| S. Malassezia furfur | 4. Urogenital area |
- P - 1; Q - 2; R - 3; S - 4
- P - 1; Q - 3; R - 2; S - 4
- P - 2; Q - 1; R - 4; S - 3
- P - 2; Q - 4; R - 3; S - 1
- P - 4; Q - 2; R - 3; S - 1
Which of the following is/are correctly matched?
- Red algae: fresh and marine waters
- Brown algae: prefers cold marine waters
- Green algae: marine intertidal and subtidal zones
- Only 1
- Only 2
- Only 3
- 1 and 2
- 1 and 3