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a
In terrestrial ecosystem larger fraction of energy flow occurs through DFC.
b
Pyramid of energy is always upright.
c
In comparison to food chains, food webs are more stable.
d
Detritus food chain is not at all connected with aquatic food chain at any level.
answer is D.
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Detailed Solution
In nature, detritus food chain (DFC) is connected with grazing food chain (GFC) at some levels; some of the organism of DFC are prey to the GFC animals, and in natural ecosystem some animals like cockroaches, crows, etc. are omnivores. These natural interconnection of food chains makes a food web.