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In a typical food chain "grass → grasshopper → frog → snake", the frog is at the:
AThird trophic level (secondary consumer)
BFirst trophic level
CFourth trophic level (option)
DDecomposer level
Answer & Solution
Correct answer: A. Third trophic level (secondary consumer)
1. Trophic levels: grass (producer, 1st) → grasshopper (primary consumer, 2nd) → frog (3rd) → snake (4th).
2. The frog eats the herbivore grasshopper.
3. Hence the frog is the secondary consumer at trophic level 3.
_Source: NCERT Class 10 Science, Ch 13 "Our Environment", §13.1.1_
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