Q3 of 67 Page 104

Which of the following ecosystems will be more productive in terms of primary productivity? Justify your answer.

A young forest, a natural old forest, a shallow polluted lake, alpine meadow.


Among the given ecosystems a young forest will be the most productive because primary productivity in an ecosystem depends upon the plant species in a given area and the rate of plant growth and number of plants growing.

So, a young forest has a higher rate of plant growth and it develops more rapidly as compared to a natural old forest. A shallow polluted lake and alpine meadow have a lower number of producers and therefore they have less productivity.


More from this chapter

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1

A farmer harvests his crop and expresses his harvest in three different ways.

a. I have harvested 10 quintals of wheat.


b. I have harvested 10 quintals of wheat today in one acre of land.


c. I have harvested 10 quintals of wheat in one acre of land, 6 months after sowing.


Do the above statements mean one and the same thing. If your answer is yes, give reasons. And if your answer is ‘no’ explain the meaning of each expression.


 2

Justify the following statement in terms of ecosystem dynamics. “Nature tends to increase the gross primary productivity, while man tends to increase the net primary productivity”.

 4

What are the three types of ecological pyramids? What information is conveyed by each pyramid with regard to structure, function and energy in the ecosystem.

 5

Write a short note on pyramid of numbers and pyramid of biomass.