The structure that participates in bacterial sexual reproduction is called .........

Select the correct statements from the given statements $(1-4)$ regarding the characteristics of some organisms.
$(1)$ Methanogens are Archaebacteria that produce methane in marshy areas.
$(2)$ $Nostoc$ is a flagellated blue-green alga that fixes atmospheric nitrogen.
$(3)$ Chemosynthetic autotrophic bacteria synthesize cellulose from glucose.
$(4)$ Mycoplasma lacks a cell wall and can survive without oxygen.

In a way,green plants and cyanobacteria have synthesized all the food on the earth. Comment.

Transfer of genetic information from one bacterium to another in the transduction process is through

The blue-green algae are so called as they have,in addition to the green pigment chlorophyll,a blue pigment known as:

Assertion: Chemosynthesis is an autotrophic nutrition.
Reason: Chemoautotrophs contain chlorophyll pigments.