NEET BIOLOGY

Detailed explanation-1: -Viruses cannot reproduce outside a living cell because they lack the cellular organisation and independent machinery which is required for the reproduction and other metabolic activities. They can only multiply inside the living cell of host by using host’s cellular machinery.

Detailed explanation-2: -Living things use energy. Outside of a host cell, viruses do not use any energy. They only become active when they come into contact with a host cell. Once activated, they use the host cell’s energy and tools to make more viruses. Because they do not use their own energy, some scientists do not consider them alive.

Detailed explanation-3: -Viruses are not made out of cells, they can’t keep themselves in a stable state, they don’t grow, and they can’t make their own energy. Even though they definitely replicate and adapt to their environment, viruses are more like androids than real living organisms.

Detailed explanation-4: -Viruses cannot reproduce outside the host because these organisms do not have the metabolic machinery of their own. Viruses do not have cytoplasm and enzymes required for reproduction. In this regard viruses must approach their respective host for reproductive components.

Detailed explanation-5: -Answer and Explanation: Viruses are not considered living organisms because they a) cannot reproduce by themselves. Viruses are not made of cells, and therefore have no capacity to replicate their genetic information and spread.