Biological Classification Test - 10

A bacterium capable of tolerating extreme heat, dryness and toxic chemicals have ability to produce endospores inside the body that help them to tide over unfavorable conditions.

When fresh water protozoan is placed in marine water, the contractile vacuole disappear because the function of vacuole is to expel out excess water but in case of marine water, the water should be retained instead of getting expelled. If the contractile vacuole will not disappear the cell will get dehydrated.

The plant cells have an eukaryotic structure with prominent chloroplasts and cell wall mainly made of cellulose.

The sexual reproduction in kingdom Animalia is by copulation of male and female followed by embryological development.

Drosera plant is partially heterotrophic. This plants capture insects to fulfill its protein requirement although it performs photosynthesis also.

Beijerinek is considered one of the founders of virology. In 1898, he published results on the filtration experiments demonstrating that tobacco mosaic disease is caused by an infectious agent smaller than a bacterium and called the fluid as Contagiumvivum fluidum(infectious living fluid).

A capsid is the protein shell of a virus. It consists of several oligomeric structural subunits made of protein called protomers. The capsid encloses the genetic material of the virus.

Most viruses have either RNA or DNA as their genetic material. The nucleic acid may be single- or double-stranded.

The entire infectious virus particle, called a virion, consists of the nucleic acid and an outer shell of protein.

T.O. Diener discovered a new infectious agent that was smaller than viruses and caused potato spindle tuber disease.

It was found to be a free RNA.

it lacked the protein coat that is found in viruses, hence the name viroid.