The non-living characteristics of viruses is ,

Options

A. Ability of multiply conly in the host
B. Ability of cause disease in the host
C. Ability to undergo mutation
D. Ability to be crystallised

Answer

### Step-by-Step Solution:

1. **Understanding Viruses**: Begin by defining what a virus is. A virus is an infectious agent that can cause disease. It is unique because it exhibits both living and non-living characteristics.

2. **Living Characteristics**: Viruses behave like living organisms when they are inside a host. They can replicate and cause infections, which are characteristics of living entities.

3. **Non-Living Characteristics**: When viruses are outside a host, they cannot perform metabolic functions. They do not have their own metabolism and cannot carry out life processes independently.

4. **Acellularity**: Viruses are acellular, meaning they are not made up of cells. They lack cytoplasm, organelles, and the necessary components to complete metabolic processes on their own.

5. **Crystallization**: One of the key non-living characteristics of viruses is their ability to crystallize when outside a host. This crystallization indicates a lack of metabolic activity and supports the idea that they behave as non-living entities in this state.

6. **Conclusion**: Among the options provided, the ability to be crystallized is the correct answer for the non-living characteristic of viruses. Other options related to multiplication, causing diseases, and undergoing mutations are all indicative of living characteristics.

### Final Answer:
The non-living characteristic of viruses is their ability to be crystallized.

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