Which one of the following are intracellular obligate parasites?
- Bacteria
- Viruses
- Slime moulds
- Blue-green algae
The Correct Option is B
Approach Solution - 1
Viruses are non-cellular, infectious, obligate, intracellular parasites. These are genetic elements (DNA or RNA) wrapped in a protein coat and are not considered to be organisms, as they cannot reproduce independently.
So, the correct answer is (B): Viruses
Approach Solution -2
Viruses are the intracellular obligate parasites. They are intracellular as they need to infect the host cell and there they reproduce and carry their life processes. They do not have the machinery to replicate and metabolise outside the host cell. They are obligate as they are completely dependent on the host for their life processes.
So, the correct answer is (B): Viruses
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Concepts Used:
Biological Classification
The process of grouping living organisms into categories is called biological classification. The most modern 5-kingdom classification was put ahead by an eminent scientist R.H.Whittaker. The five-kingdom classification is based on the criteria like cell structure, mode of nutrition, body form, and reproduction. One of the most important characteristics of this system is that it follows the evolutionary sequence of living organisms. The organisms are classified into distinct taxa or levels like Kingdom, Phylum, Division, Class, Order, Family, Genus, and Species. The 5 kingdoms are as follows:
