Subject: why do young leaves turn brown when too much water is added to the plant

Dear Sir/Madam,
Good morning. I would like to know why only young leaves will turn brown when 
there is too much water added to the plant? How about the older leaves, will 
they also turn brown? What is actually happening? When leaves turn brown, does 
it mean that they are dead leaves. When there is too little water added to the 
plant, will the young leaves also turn brown?
Kindly explain and enlighten me on this. Thank you very much and have a nice 
day.

Re: why do young leaves turn brown when too much water is added to the plant