1.  Why do temperate regions show a lower value of primay productivity as compared to tropical region?Give two reason.
2. State the diference between first trophic level of detritus food chain andgraizing food chain?
3. List the features that make a stable biological community?
4. What ecological succession on bare rock called?How do they help in establishing the next type of vegetation.
5. How does succession differ in terrestial and aquatic system?

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The temperature use to be extreme in temperate regions which is a limiting factor for production whereas, plenty of rainfall, adequate sunlight and moderate temperature has made tropical region highly productive. Temperate regions have several snow cover areas where productivity becomes very low. Thus tropical region has higher primary productivity than temperate regions.