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...Ncert solutions for class science chapter our environment questions page what are trophic levels give an example of a food chain and state the different in it solution transfer or energy takes place at various these known as grass goat man represents first level second third is role decomposers ecosystem following decomposer they act cleansing agents by decomposing dead plants animals help recycling nutrients provide space new being biosphere putting back elements into water soil air reuse producers like crop why some substances biodegradable non reason because microorganisms bacteria saprophytes have specific to play can breakdown only natural products paper wood etc but cannot made plastics based on this any two ways which substance would affect keep clean easily decomposed go through geo chemical cycle with cause pollution may bio magnification resulting end human ozone how does molecule formed three atoms oxygen isotope main function layer protection earth s surface from harmful uv...