Physical, chemical or biological factors which transform a normal cell into cancerous cell, known as :-

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the term that describes physical, chemical, or biological factors that can transform a normal cell into a cancerous cell.

2. **Identifying the Factors**: Recognize that there are various types of factors that can lead to cancer:
- **Physical Factors**: These can include radiation or other environmental influences.
- **Chemical Factors**: These are substances that can cause mutations or changes in DNA, such as certain chemicals known as mutagens.
- **Biological Factors**: These include biological agents like viruses that can lead to cancer.

3. **Defining the Term**: The collective term for these factors is "carcinogens." Carcinogens are agents that can cause cancer by altering cellular metabolism or damaging the genetic material within cells.

4. **Examples of Carcinogens**:
- **Biological Carcinogens**: Oncogenes are genes that can lead to cancer when mutated or expressed at high levels.
- **Chemical Carcinogens**: Substances like benzene or formaldehyde that can induce cancer.
- **Physical Carcinogens**: Oncoviruses are viruses that can lead to cancer development.

5. **Conclusion**: Therefore, the answer to the question is that physical, chemical, or biological factors which transform a normal cell into a cancerous cell are known as "carcinogens."

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