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...St mary s co ed school harda class x sub biology chapter our environment ncert solutions of page number question what are trophic levels give an example food chain and state the different in it answer various steps a at which transfer or energy takes place called operating grassland is given below grass insects frog birds this represents first level grasshopper second third eagle fourth tropic role decomposers ecosystem i help decomposing dead bodies plants animals hence act as cleansing agents ii also putting back elements made into soil air water for reuse by producers like crop iii they recycling nutrients near railway station mp ph iv decompose remains thereby providing space new life to settle biosphere why some substances biodegradable non microorganism bacteria other decomposer organisms saprophytes present specific their action break down materials products from natural say paper but do not man such plastics so due property being that waste whereas others any two ways would aff...