Question

what distinguishes a biotic plant disease from an abiotic one? it results from poor soil ph alone. it is caused by a living microorganism infecting plant tissue. it only affects leaves, not stems. it can be reversed with proper watering.

Explanation:

Biotic plant diseases are caused by living organisms (like fungi, bacteria, viruses). Abiotic ones are due to non - living factors (e.g., poor soil pH, improper watering). The first option is abiotic (soil pH), the second is biotic (living microorganism), the third is not a general distinction (both can affect different plant parts), and the fourth is abiotic (watering).

Answer:

It is caused by a living microorganism infecting plant tissue.