Some photosynthetic organisms contain chloroplasts that lack photosystem ii, yet are able to survive. the best way to detect the lack of photosystem ii in these organisms would be

to determine if they have thylakoids in the chloroplasts.
to test for liberation of o2 in the light.
to test for co2 fixation in the dark.
to do experiments to generate an action spectrum.
to test for production of either sucrose or starch.