Q12 of 67 Page 104

What will be the P/R ratio of a climax community and a pioneer community. What explanation could you offer for the changes seen in P/R ratio of a pioneer community and the climax community.

P/R ratio refer to Production/Respiration ratio, it represents the relationship between the productivity and its consumption. For a stable community P/R ratio = 1.

For Pioneer species P/R >1, in order to establish a community organic matter is needed to be accumulated.


For climax communities P/R=1. Climax communities being stable, utilise all the products.


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8

What will happen to an ecosystem if:

a. All producers are removed;


b. All organisms of herbivore level are eliminated; and


c. All top carnivore population is removed


 9

Give two examples of artificial or man made ecosystems. List the salient features by which they differ from natural ecosystems.

 10

The biodiversity increases when one moves from the pioneer to the climax stage. What could be the explanation?

 11

What is a biogeochemical cycle. What is the role of the reservoir in a biogeochemical cycle. Give an example of a sedimentary cycle with reservoir located in earth’s crust.