NEET BIOLOGY

Detailed explanation-1: -A virus is a tiny, infectious particle that can reproduce only by infecting a host cell.

Detailed explanation-2: -If the infectious agent can only multiply inside living cells, this agent would likely be: Bacteria.

Detailed explanation-3: -Some of those that do cause disease can only replicate inside the cells of the human body and are called obligate pathogens.

Detailed explanation-4: -Infectious agents are organisms that are capable of producing infection or infectious disease. They include bacteria, fungi, viruses, and parasites.

Detailed explanation-5: -The agents that cause disease fall into five groups: viruses, bacteria, fungi, protozoa, and helminths (worms). Protozoa and worms are usually grouped together as parasites, and are the subject of the discipline of parasitology, whereas viruses, bacteria, and fungi are the subject of microbiology.