Which one of the following elements is present in green pigment of leaf?

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Q: 95 (CDS-I/2014)

Which one of the following elements is present in green pigment of leaf?
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question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,59,14,59,10,1,3

keywords: 

{'green pigment': [0, 0, 0, 2], 'magnesium': [1, 0, 2, 3], 'phosphorus': [1, 0, 1, 0], 'calcium': [2, 0, 0, 4], 'elements': [0, 0, 2, 5], 'leaf': [13, 0, 2, 4], 'iron': [0, 0, 1, 1]}