Question
Biology Question on energy flow through ecosystems
The dominant second trophic level, in a lake ecosystem, is
A
phytoplankton
B
zooplankton
C
benthos
D
plankton.
Answer
zooplankton
Explanation
Solution
Trophic level is a step or division of food chain which is characterized by the method of obtaining its food. The two fundamental trophic levels are producers and consumers. Producers belong to the first trophic leveL In a lake the producers are mainly some rooted or floating plants and phytoplanktons. Primary consumers form the second trophic level. They feed on living plants or plant parts. The primary consumers are zooplanktons.