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6 . A simple detritus food chain starts with
A. green plant
B. wastes of organisms and dead organisms
C. both of the above
D. none of these

7 . In a food chain humans are
A. Producers 
B. Primary consumers
C. Secondary consumers
D. Primary and secondary consumers 

8 . Facultative Bacteria exisiing in which type of Environmental condition?
A. Presence of oxygen B. Absence of oxygen
C. Both (a) and (b) D. None of these

9 . Word "Environment" is derived from :
A. Italy  B. French
C. German D. English

10 . Organisms who directly feed on producers are called :
A. Herbivores B. Omnivores
C. Carnivores D. Decomposers 



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