MCQ
The smallest disease causing agent is:
- AProtozoa
- BVirus
- CBacteria
- DFungi
Explanation:
A virus is a small infectious agent that replicates only inside the living cells of other organisms.
Viruses can infect all types of life forms, from animals and plants to microorganisms, including bacteria and archaea.
Virus is smaller than ants, lice or bacteria.
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($i$) It is made of a single thin layer of flattened cells with irregular boundaries.
($ii$) They are found in the walls of blood vessels and air sacs of lungs.
($iii$) They are involved in functions like forming a diffusion boundary. Which of the following characteristics of tissue is being described by the above statements?