question_answer 45)

  Select the mis-matched pair in the following and correct it.

(a)Bio-magnification	Accumulation of chemicals at the successive trophic levels of a food chain
(b)Ecosystem	Biotic components of environment
(c) Aquarium	A man-made ecosystem
(d) Parasites	Organsims which obtain food from other living organisms

Answer:

                  (b) An ecosystem consists of biotic components (comprising living organisms) and abiotic components (comprising physical factors like temperature etc.) of environment.