| 1. | They are most abundant bacteria in nature. |
| 2. | The majority are important decomposers. |
| 3. | None of them is capable of fixing atmospheric nitrogen. |
| 4. | Some are pathogens causing damage to human beings, crops, farm animals and pets. |
| Column-I [Kingdom] |
Column-II [Cell wall] |
||
| A. | Monera | P. | Absent |
| B. | Fungi | Q. | Chitinous |
| C. | Plantae | R. | Polysaccharide + amino acid |
| D. | Animalia | S. | Cellulosic |
| A | B | C | D | |
| 1. | R | S | Q | P |
| 2. | R | Q | S | P |
| 3. | Q | S | R | P |
| 4. | P | Q | R | S |
| I: | Bacteria reproduce sexually |
| II: | Transformation of a bacterial cell is sexual reproduction |
| 1. | are capable of fixing atmospheric nitrogen. |
| 2. | are photosynthetic autotrophs and have gas vacuoles. |
| 3. | do not have peptidoglycan in their cell walls. |
| 4. | depend on other organisms or on dead organic matter for food. |
| 1. | They thrive in environments with high concentrations of nitrogen and sulphur compounds. |
| 2. | They are sensitive to airborne pollutants, which disrupt their symbiotic relationship. |
| 3. | They absorb heavy metals from the environment promoting their growth. |
| 4. | They can metabolize and break down organic pollutants in the air. |
| 1. | M.W. Beijerinck | 2. | W.M. Stanley |
| 3. | Louis Pasteur | 4. | Dmitri Ivanowsky |