(A) Calcium (X)
(B) Nitrogen ()
(C) Phosphorous (X)
(D) Hydrogen (X)
Answers: Nitrogen is a special constituent of chlorophyll without which photosynthesis is not possible .
(A) Calcium (X)
(B) Nitrogen ()
(C) Phosphorous (X)
(D) Hydrogen (X)
Answers: Nitrogen is a special constituent of chlorophyll without which photosynthesis is not possible .
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