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Ans: (d) A. G. Tansley.Explanation: Word Ecosystem was first coined by Tansley in 1935 and previously the term 'biocoenosis' was used.
The term 'Nuclein' for the genetic material was used by (1) Mendel (2) Franklin (3) Meischer (4) Chargaff
The term “New Systematics” was introduced by (a) Bentham and Hooker (b) Linnaeus (c) Julian Huxley (d) A.P. de Candolle.