Name the organism from which the 'cry' genes are isolated. Mention with the help of suitable example why and how bio-technologists have made use of 'cry' genes.

Explanation

### Step-by-Step Solution:

1. **Identify the Organism**: The 'cry' genes are isolated from the bacterium **Bacillus thuringiensis**. This organism is known for producing proteins that are toxic to certain insects.

2. **Purpose of 'cry' Genes**: The 'cry' genes encode for proteins that function as insecticidal toxins. These proteins are specifically toxic to certain groups of insects, making them valuable in agricultural biotechnology.

3. **Application in Biotechnology**: Biotechnologists have utilized 'cry' genes by incorporating them into various crop plants to enhance pest resistance. A notable example is **BT cotton**, which has been genetically modified to express the 'cry' genes.

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