Consider the following statements 1 Phototrophic bio film microbial fuel cell MFCs does not require ...........

Explanation:

A microbial fuel cell is a device that converts chemical energy to electrical energy by the catalytic reaction of microorganisms.
A typical microbial fuel cell consists of anode and cathode compartments separated by a cation (positively charged ion) specific membrane. In the anode compartment, fuel is oxidized by microorganisms, generating CO2, electrons and protons.
Electrons are transferred to the cathode compartment through an external electric circuit, while protons are transferred to the cathode compartment through the membrane.

Justification: Statement 1: Phototrophic biofilm MFCs (PBMFCs) are the ones that make use photosynthetic microorganism like chlorophyta, cyanophyta etc., since they could carry out photosynthesis and thus they act as both producers of organic metabolites and also as electron donors Statement 2: Some MFCs use electrochemically active bacteria to transfer electrons to the electrode (electrons are carried directly from the bacterial respiratory enzyme to the electrode).
Some MFC's produce electric current by the bacterial decomposition of organic compounds in water. But, there are microbial electrolysis cells (MEC) also which reverse this process to generate hydrogen or methane by applying a voltage to bacteria.