Which one of the following elements is present in green pigment of leaf? निम्नलिखित में से कौन-सा एक मूलतत्त्व पत्ते के हरे वर्णक में स्थित रहता है?

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Which one of the following elements is present in green pigment of leaf? निम्नलिखित में से कौन-सा एक मूलतत्त्व पत्ते के हरे वर्णक में स्थित रहता है?