But what exactly gives them their vibrant color? Chlorophyll. It turns sunlight into food for plants, so they look healthy and function properly. In other words, it's what's responsible for the ...

A study study has uncovered the complex role of abscisic acid (ABA) in regulating chlorophyll accumulation in apple plants.

The parts without chlorophyll do not photosynthesise, and so they do not make starch and the iodine does not change colour. The leaf on the left is a variegated leaf. The green parts contain ...