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Question

Select the correct combination of the statements (1-4) regarding the characteristics of certain organisms
1. Methanogens are archaebacteria which produce methane in marshy areas
2. Nostoc is a filamentous blue-green alga which fixes atmospheric nitrogen
3. Chemosynthetic autotrophic bacteria synthesize cellulose from glucose.

4. Mycoplasma lacks a cell wall and can survive without oxygen.
The correct statements are:


A
2, 3
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B
1, 2, 4
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C
1, 2, 3
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D

2, 3, 4

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Solution

The correct option is B 1, 2, 4

The correct statements are
Methanogens are archaebacteria which produce methane in marshy areas.
Nostoc is a filamentous blue-green alga which fixes atmospheric nitrogen
Mycoplasma lacks a cell wall and can survive without oxygen.

Statement 3 after correction:
Chemosynthetic organisms use chemical reactions to convert inorganic substances into nutrients. Example: Sulfur bacteria, Nitrogen bacteria.


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