Q. Outline salient features of carbon cycling in an ecosystem.

Q. 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

Q. Define ecological pyramids and describe with examples, pyramids of number and biomass.

Q. Write important features of a sedimentary cycle in an ecosystem.

Q. What is primary productivity? Give brief description of factors that affect primary productivity.

Q. Fill in the blanks.
(a) Plants are called as .......... because they fix carbon dioxide.
(b) In an ecosystem dominated by trees, the pyramid (of numbers) is .......... type.
(c) In aquatic ecosystems, the limiting factor for the productivity is ..........
(d) Common detritivores in our ecosystem are ..........
(e) The major reservoir of carbon on earth is ..........

Q. Define decomposition and describe the processes and products of decomposition.

Q. What is the percentage of photosynthetically active radiation(PAR), in the incident solar radiation.

1. 50%
2. 100%
3. 1 - 5%
4. 2 - 10%

Q. The second trophic level in a lake is
(a) Phytoplankton
(b) Zooplankton
(c) Benthos
(d) Fishes