The number of trophic levels in the grazing food chain are restricted because of the:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Transmission of only 10% energy to successive levels
Option (2) Transmission of only 10% energy to successive levels — Correct. At each step only about 10 per cent of the energy passes on to the next trophic level (the 10 per cent law). After a few steps too little energy is left to support another level, so grazing food chains have only a few trophic levels.
NCERT Extract:
Energy Flow – “The number of trophic levels in the grazing food chain is restricted as the transfer of energy follows 10 per cent law – only 10 per cent of the energy is transferred to each trophic level from the lower trophic level.”
Figure 14.3 Energy flow through different trophic levels