How might a drought affect a grland food webs? which trophic level.....?

if there is drought, then there is little gr which means little food, which means many organisms die. Therefore, the autotrophic producer trophic would be affected, because without water, photosynthesis cannot occur because water molecules are necessairy for photosystem II inwhich water is split. therefore, the plants will not photosynthesise, and they will die off, and cause all the other trophic levels to suffer as well because only 10 percent of the energy is ped on from trophic level to trophic level