What is contributed from the outer space in an ecosystem?

Related Mcqs:

1. In a comparative study of grassland ecosystem and pond ecosystem it may be observed that:

   A. Primary and secondary consumers are similar B. Both biotic and abiotic components are different C. The biotic components are almost similar D. The abiotic components are almost similar...

2. Exotic species, which brought for plantation from some other country to our country or even from one ecosystem to other ecosystem are called, as exotic species like:

   A. Pinus nigra – Japan B. Euralyptus – Australia C. Polunia – China D. All of the above...

3. An ecosystem may be defined as:

   A. A localized association of several plants and animals B. Different communities of plants, animals and microbes, together with their physico-chemical environments C. Different communities of plants and microbes plus their physico-chemical environments D. None of the above...

4. The importance of ecosystem lies in:

   A. Cycling of materials B. Flow of energy C. Both (a) & (b) D. None of the above...

5. The biotic and abiotic components of the ecosystem are connected through:

   A. Standing quality B. Climatic regime C. Transducers D. Humification and mineralization...

6. Every ecosystem must have a continuous external source of:

   A. Energy B. Oxygen C. Living organism D. Bacteria...

7. The cybernetics of an ecosystem refers to:

   A. Harvest index B. A feedback mechanism C. Regulation of equilibrium D. Reverse energy flow...

8. The term homeostasis in an ecosystem refers to:

   A. A feedback mechanism B. A self-regulatory mechanism C. State of equilibrium D. Influence of production...

9. Ecosystem receives nitrogen from outside through:

   A. Biological nitrogen fixation B. Electrification of nitrogen C. Industries D. All the above...

10. Which ecosystem has the highest primary productivity?

    A. Pond ecosystem B. Lake ecosystem C. Grassland ecosystem D. Forest ecosystem...