Which, among the following, are the smallest living cells, known without a definite cell wall, pathogenic to plants as well as animals and can survive without oxygen?
1. | Pseudomonas | 2. | Mycoplasma |
3. | Nostoc | 4. | Bacillus |
Cell wall is absent in:
1. Nostoc
2. Aspergillus
3. Funaria
4. Mycoplasma
Select the correct combination of the statements (a-d) regarding the characteristics of certain organisms:
(a) | Methanogens are archaebacteria that produce methane in marshy areas |
(b) | Nostoc is a filamentous blue-green alga that fixes atmospheric nitrogen |
(c) | Chemosynthetic autotrophic bacteria synthesize cellulose from glucose |
(d) | Mycoplasma lack a cell wall and can survive without oxygen |
The correct statements are:
1. | (a), (b) and (c) | 2. | (b), (c) and (d) |
3. | (a), (b) and (d) | 4. | (b) and (c) |