What is primary productivity? Give brief description of factors that affect
primary productivity.
Distinguish between
(a) Grazing food chain and detritus food chain
(b) Production and decomposition
(c) Upright and inverted pyramid
(d) Food chain and Food web
(e) Litter and detritus
(f) Primary and secondary productivity
What is the percentage of photosynthetically active radiation (PAR) in
the incident solar radiation?
(a) 100%
(b) 50 %
(c) 1-5%
(d) 2-10%
The second trophic level in a lake is
(a) Phytoplankton
(b) Zooplankton
(c) Benthos
(d) Fishes
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