question_answer 36)

  In which of the following groups of organisms, food material is broken down outside the body and absorbed? (a) Mushroom, green plants, Amoeba                   (b) Yeast, mushroom, bread mould (c) Paramecium, Amoeba, Cuscuta                          (d) Cuscuta, lice, tapeworm

Answer:

                  (b) Yeast, mushroom and bread mound are saprophytes they break down and convert complex organic molecules present in dead and decaying matter into simpler substances outside their body. These simpler substances are then absorbed by them,(i.e., saprotrophic nutrition). Green plants are autotrophic (make their own food through photosynthesis). Amoeba and Paramecium are holozoic (take solid or fluid organic food) and Cuscuta, lice, tapeworm are parasitic (live on food material obtained from the body of host).