Seasonal changes bring about scenes like this one. plant cells respond to changes in and as a result, photosynthesis slows and leaves change color.

The answer is; light intensity & temp change

As winter approaches, the chlorophyll molecules reduce (by being broken down) and this is why leaves begin to turn orange as there are more red pigments (Xanthophyll) than the green pigment. This is because as winter approached, the light intensity decreases and it gets colder. Therefore, the plants begin to prepare for the harsh incoming weather. Most deciduous trees even begins to shed their leaves.

freezing

deposition

condensation

explanation;

melting also called fusion is the process where solid becomes liquid, sublimation is the process where solid becomes gaseous without first changing to liquid, deposition involves change from gaseous to solid state, freezing involves change from liquid to solid, boiling or evaporation involves change of liquid to gaseous state, while condensation is the change from gaseous state to liquid state.

endothermic reactions involves absorption of heat from the surroundings or the environment while exothermic reactions involves loss of heat energy to the surroundings.

in this case, sublimation, evaporation and melting are endothermic reactions (gain energy from the environment) while, freezing, deposition and condensation are exothermic (loss of energy to the surroundings) reactions.

the gas collects in coils that then becomes a liquid that then flows through the coils inside the refrigerator