Leaves usually die because they are cut off from the nutrition and water of the plant. The chlorophyll in the leaves is usually not removed, just allowed to metabolize.
*To learn more about what happens to leaves in autumn, see the related link below.
The lysosome is the organelle most likely to be missing from the cells of a leaf. The leaf cells have membranes, a wall, and chloroplast.
it dies
Because the leaf is not burning.
Chemical
It is a chemical change, a degradation of the compounds from the leaf.
Chemical. It has to do with the closing of the part that connects the leaf to the tree and the lack of nutrients causes the leaf to turn colours.
Chemical
chemical
It's called Chlorophyll, it makes the leaf green and helps with photosynthesis.
Agent Orange was the toxic, leaf-killing chemical sprayed over Vietnam.
Crushing a leaf is a physical change, not a chemical change because the chemical composition of the leaf remains the same before and after crushing. However, if the crushing process causes the leaf to release certain chemicals due to breaking of cell walls, then it can result in a chemical change.
The change is leaf color is a chemical change.