1. What does destruction refer?

failed in large part due to unexpected problems with the systems'__________:
A) Atmospheric conditions
B) Hydrologic cycle
C) Nutrient cycle
D) Lithospheric conditions
E) Energy cycle
141. How many basic types of food chains in the ecosystems?
A) 5
B) 6
C) 2
D) 7
E) 3
142
. Choose the relevant determination for “Saprophytic or Detritus food chain” 
(DFC).
A) In this type of food chain, large organisms either the producer or the consumer is 
exploited and therefore the food passes to the smaller organism
B) The tendency of a community to return to its original state after a disturbance 
(competition, temporarily changing environment, etc.)
C) This is the normal food chain that we observe in which plants are the producers and the 
energy flows from the producers to the herbivores (primary consumers), then to carnivores 
(secondary consumers) and so on
D) In this type of food chain, the dead organic matter occupies the lowermost level of the 
food chain, followed by the decomposers and so on
E) The ability of a community to avoid displacement from its present state by a disturbance
143. Which one of the followings is not a function of the ecosystem?
A) It is also responsible for the cycling of nutrients between biotic and abiotic components
B) It regulates the essential ecological processes, supports life systems and renders 
stability
C) It maintains a balance among the various trophic levels in the ecosystem
D) It helps speed up metabolism, or the chemical reactions in our bodies, build substances 
and break others
E) The abiotic components help in the synthesis of organic components that involves the 
exchange of energy
144. Phosphorus is difficult for plants and animals to access in nature because:
A) most phosphorus in the environment is bound to carbon, nitrogen, and hydrogen

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B) it is gaseous form so they cannot consume it
C) most phosphorus in the environment is stored in reservoirs
D) it reacts quickly with other elements, like oxygen.
E) it is typically found as a phosphate