Substances can either absorb the wavelength (Color) of light (the energy is used) or reflect that wavelength (you will see the color).  

Chlorophyll absorbs light for photosynthesis and since chlorophyll is is green it reflects the green and absorbs the re and blue. The red and blue are then used for photosynthesis and the green is reflected which is why we see the plant as green.

Equation: 6H2O + 6CO2 + Light Energy -> C6H12O6 + 6O2.

Stages: 1) A set of reactions that trap light energy and convert it to chemical energy of ATP.

2) A set of reactions where ATP is used to help bond carbon dioxide and water molecules together to create a sugar, such as glucose.

HL Biology Book

To obtain energy needed for life, organisms depend on the processes of cellular respiration and photosynthesis. Though they share the same function of changing energy from one form to another, there are many differences between cellular respiration and photosynthesis in regard to the input and output molecules, energetics, cellular location, and ecological importance. 

-The chemical equations of cellular respiration and photosynthesis are opposites.

(http://www.studymode.com/essays/Cellular-Respiration-Vs-Photosynthesis-141565.html)

Sunlight mainly gives off red and blue wavelengths of lights are most common among sunlight, so the chlorophyll absorbs these two types of wavelength the most, indicated by the spikes in the graph when the wavelength of the light is in the blue and red region. Because green is not absorbed but reflected, as shown by the lower levels of amount of light absorbed, leaves tend to be green, as visible colors are because of the light that is reflected rather than absorbed.

5 Differences 
1)Cellular respiration depends on oxygen as a substrate. 
2)Photosynthesis utilizes 2 electron transport chains (not just 1). 
3)In Photo. , energy is provided by photons and not catabolic processes, processes in which more complex structures are broken down into simpler ones, as in cell. resp. 
4)Photosynthesis involves the production of NADPH (CR involves NADH and FADH2) 
5)Photosynthesis involves CO2 and H20 as substrates (splitting h20 provides the electrons for the process).

Substrate in this case refers to the thing that CAUSES the change, much like in enzymes.

Courtesy of Yahoo Answers.

Photosynthesis 
Is the chemical process where plants can capture and organically fix the energy of the sun. This chemical reaction can be described by the following simple equation: 
CO₂ + H₂O + light energy = Sugars + O₂
The main product of photosynthesis is a carbohydrate, such as the sugar glucose, and oxygen which is released to the atmosphere (the earth's atmosphere presently contains 20% ofO₂) 

Respiration 
Is the typical process where mitochondria of cells of organisms release chemical energy from sugar and other organic molecules through chemical oxidation. This process occurs in both plants and animals. In most organisms, respiration releases the energy required for all metabolic processes. This chemical reaction can be described by the following simple equation: 
Sugars + O₂ = CO₂ + H₂O + released energy 

-Through the process of photosynthesis, green plants absorb solar energy and remove carbon dioxide from the atmosphere to produce carbohydrates (sugars). Plants burn these carbohydrates (and other products derived from them) through the process of respiration, the reverse of photosynthesis. Respiration releases the energy contained in sugars for use in metabolism. 
-This process is not balanced because the oxygen used for respiration is much less than what is given off during the photosynthetic reaction and the carbon dioxide given off is much less than what is taken up during photosynthesis. This is because plants need the sugar molecules not only for energy but also for structural elements (plants are largely cellulose - which is a long sugar molecule).

Chlorophyll - green.

Carotenoid - yellow, orange, brown.

Anthocyanin - red.