The second trophic level in a lake is-
(a) Phytoplankton
(b) Zooplankton
(c) Benthos
(d) Fishes
(b) Zooplankton
Zooplankton are primary consumers in aquatic food chains that feed upon phytoplankton. Therefore, they are present at the second trophic level in a lake.
1. 'Barr body' is derived from
2. Normal blood pressure of man is
3. Where does cellular respiration take place in the cell?
5. The normal blood pressure in human beings is
7. Tidal volume of air in a normal healthy man during inspiration is about
8. Which organ gets affected in Weil's disease?