brown dried leaf

So for those of you who have had houseplants before, there's a good chance your plants might've contained dried brown areas on the leaves.

back side

The main reason to why leaves lose their green color (as seen above) is because the chlorophyll actually break down. However, there are various reasons to what can cause houseplants to change their leaf colors to brown. Some of the reasons include giving too much/little water (which also explains why the leaf I examined was quite dry) and also not being humid enough.

front side

As seen here, the cells don't seem to display the chlorophyll a normal leaf would have. Since chlorophyll is why the leaf retains its green color, its clear as to why we are able to notice a dead leaf (like this one) in an instant.