Need help asap

ok so my plant is in about week 4 of flowering and i have her just under some floro's everything has been going really well. until this mournig when i went to check on her, some of her leaves are dry? i mean they werent like this yesterday and some of them are to the point where there so dry they break? can someone please shed some light on this, should i cut the leaves that are dried off? please i need some advice. thanks also if i am suppose to cut the dried leafs off can i just use any scissors?

could be nute burn,,,,,is the ph fine?u shouldnt of cut the leaves off,,you should let them die off then pull um off,,you can use scissors of you want,,,some pics would be good just to be sure,,,,,peace

i didnt take any of the leaves off, i think my problem is the ph, i dont have a ph level tester tho, what are some ways to get the ph back to where i want it. i also didnt use and nutes today when i watered just plain water.