6. What do you mean by ecological pyramids? Give an account of different types of ecological pyramids in forest ecosystems.
7. What is plant succession? Describe the different stages of succession in
a pond.
8. Wrie notes on any two of the following:
(a) Energy flow in an ecosystem
(b) Ecological niche
(c) Soil Profile
(d) Endemism
9. What is water pollution? Discuss the sources, effect and suitable control measures of water pollution.
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