is chlorophyll needed for cellular respiratin
No, chlorophyll is not directly involved in cellular respiration. Cellular respiration is the process by which cells convert glucose and oxygen into carbon dioxide, water, and energy in the form of ATP (adenosine triphosphate).
However, chlorophyll does play a crucial role in photosynthesis, which is the process by which plants and some other organisms convert light energy into chemical energy in the form of glucose. During photosynthesis, chlorophyll captures light energy and uses it to combine carbon dioxide from the air and water from the plant's cells to produce glucose.
The glucose produced during photosynthesis is then used in cellular respiration to release energy. In cellular respiration, glucose molecules are broken down in a series of chemical reactions, ultimately producing ATP. This process occurs in the mitochondria of plant and animal cells.
So, while chlorophyll indirectly supports cellular respiration by producing glucose through photosynthesis, it is not directly involved in the cellular respiration process itself.
I assume you are referring to plants only.
Since this is not my area of expertise, I searched Google under the key words "cellular respiration chlorophyll" to get these possible sources:
http://waynesword.palomar.edu/photsyn1.htm
http://www.globalchange.umich.edu/globalchange1/current/lectures/kling/energyflow/PSN_primer.html
http://www.buzzle.com/articles/photosynthesis-and-cellular-respiration.html
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.
I hope this helps. Thanks for asking.