The substances which have very low ignition temperature and can easily catch fire with a flame are called _______ substances.

Explanation

To answer the question, we need to identify the term that describes substances with very low ignition temperatures that can easily catch fire.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for a term that describes substances that have low ignition temperatures and can easily catch fire.

2. **Defining Ignition Temperature**: Ignition temperature is the minimum temperature at which a substance will ignite and start burning. Substances with low ignition temperatures can ignite easily when exposed to a flame.

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