Gram +(ve) and Gram –(ve) bacteria are separated on the basis of their cell wall composition. Christian Gram, on the basis of staining behaviour of the cell wall with Gram’s stain, grouped bacteria into Gram +ve and Gram –ve type. The bacteria which retain blue or purple colour after staining are Gram +ve e.g. Bacillus subtilis and which loses blue colour is Gram –ve e.g. E. coli. In Gram –ve, stain is washed due to high lipid content in the cell having thick wall, Gram +ve has single layered cell wall rich in peptidoghycans which retain the colour.

Correct Option: A

Gram +(ve) and Gram –(ve) bacteria are separated on the basis of their cell wall composition. Christian Gram, on the basis of staining behaviour of the cell wall with Gram’s stain, grouped bacteria into Gram +ve and Gram –ve type. The bacteria which retain blue or purple colour after staining are Gram +ve e.g. Bacillus subtilis and which loses blue colour is Gram –ve e.g. E. coli. In Gram –ve, stain is washed due to high lipid content in the cell having thick wall, Gram +ve has single layered cell wall rich in peptidoghycans which retain the colour.

Archaebacteria are the most ancient and halogenous group of bacteria and are called living fossils.

Correct Option: D

Archaebacteria are the most ancient and halogenous group of bacteria and are called living fossils.

Cyanobacteria are oxygenic photoautotroph. Many members perform nitrogen fixation.

Correct Option: A

Cyanobacteria are oxygenic photoautotroph. Many members perform nitrogen fixation.

Transduction is virus mediated gene transfer in bacteria.

Correct Option: A

Transduction is virus mediated gene transfer in bacteria.

Linnaeus put forward an “Artificial system” of plant classification which was based on sexual characters. It is commonly also called as Sexual System of plant classification.

Correct Option: B

Linnaeus put forward an “Artificial system” of plant classification which was based on sexual characters. It is commonly also called as Sexual System of plant classification.