Just wondering: why the Calvin Cycle can occur in the dark, but indirectly relies on sunlight? Thank you for your explanation.

Answer 1

Since this is not my area of expertise, I searched Google under the key words "Calvin cycle sunlight dark" to get these possible sources:

http://www.chemistryexplained.com/Ny-Pi/Photosynthesis.html
http://answers.yahoo.com/question/index?qid=20071214102505AA6vPYj
http://en.wikipedia.org/wiki/Photosynthesis
http://72.14.253.104/search?q=cache:IsvqTEpCskIJ:www.lamission.edu/lifesciences/lecturenote/sfbio3/Photosynthesis.doc+Calvin+cycle+sunlight+dark&hl=en&ct=clnk&cd=6&gl=us&client=safari
http://www.mrs.umn.edu/~goochv/CellBio/lectures/darkrxn/darkrxn.html

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.

I hope this helps. Thanks for asking.