Final answer:
The statement is true. Photochemistry does produce ozone and peroxyacetyl nitrates (PAN), and both of these are known to be harmful to plants, causing effects such as chlorotic stippling and damage to young leaves.
Step-by-step explanation:
The statement photochemistry produces ozone and peroxyacetyl nitrates (PAN), which are both damaging to plants, is True.
Plants are negatively impacted by the presence of pollutants like nitrogen oxides, ozone, and peroxyacetyl nitrate (PAN). Ozone exposure can lead to chlorotic stippling, which manifests as yellow spots on the leaves. PAN is particularly destructive to the younger leaves of plants.
In addition, these compounds are part of the formation of photochemical smog, which is a type of air pollution associated with sunny, hot days and can cause significant economic losses in agriculture, particularly in regions susceptible to smog, like southern California.