Kalos - I'm no expert on Kingdom: Plantae or the processes of photosynthesis.
However, I've learnt a little bit about plant tissues, organs and processes from two excellent lecturers. One specialises in the microphytobenthos of lakes and estuaries, the other in florigenic/antiflorigenic signalling in Arabidopsis.
Plants have physical and chemical defence mechanisms against grazers - clear evidence that they were not put on earth by God for 'our enjoyment'.
Also, photosynthesis is no miracle - miracles are events which do not obey scientific laws!