Q. Which is the only metal present in chlorophyll?
Answer: Magnesium
Notes: Chlorophyll or green leaves contain magnesium ions present in the chloroplast of all green plants. Magnesium ion is found in the middle of the porphyrin ring.

This question is part of 40000+ General Studies MCQ Series Course on GKToday Android app. Question Number: 45 in 14. Photosynthesis, Respiration and Nutrition in Plants in above course in App.