The most abundant prokaryotes helpful to human in making curd from milk and in production of antibiotics are the ones categorized as
1. cyanobacteria
2. archaebacteria
3. chemosynthetic autotrophs
4. heterotrophic bacteria
Which of the following is incorrect about bacteria?
1. Simple structure
2. Not so extensive metabolic activity
3. Complex behaviour
4. Can be autotrophic
Chemosynthetic autotrophic bacteria does not help in recycling of
1. Nitrogen
2. Iron
3. Sulphur
4. Mangnese
Chemosynthetic bacteria does not use which inorganic substrate?
1. Nitrites
2. Nitrates
3. Chlorides
4. Both (1) and (2)
Chemosynthetic autotrophs derive energy by
1. By sunlight
2. By oxidation of inorganic substances
3. By reduction of inorganic substances
4. By reduction followed by oxidation of inorganic substances
The majority of heterotrophic bacteria are
1. Decomposers
2. Autotrophs
3. Lithotrophs
4. Organotrophs
Lactobacillus comes under which category
1. Autotrophs
2. Lithotrophs
3. Organotrophs
4. Heterotrophs
Leguminous plants have bacteria with which kind of mode of nutrition-
1. Heterotrophs
2. Autotrophs
3. Lithotrophs
4. Organotrophs
Which of the following statements is true for Heterotrophic bacteria?
| 1. | They fix nitrogen in legume roots. |
| 2. | The majority are important decomposers. |
| 3. | Helpful in making curd from milk and production of antibiotics. |
| 4. | All of these. |
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