Chitinase is a protein that breaks down the cell walls of pathogenic fungi when they attack plants. What sort of response is this?

Plant immune response

Explanation:

The plants like animal cells do not contain adaptive immunity but they contain proteins which can help recognise and kill the pathogen.

These could be present on the surface to recognise the pathogen and could be enzymes that can act on the pathogen. These proteins are known as pathogen-related proteins.

In the given question, when the fungal cells infect the plant, the plants release chitinase which can break the glycosidic bonds of the chitin present in the chitin layer of the cell wall of fungi.

Thus, the plant immune response is the correct answer.

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