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SLM305 6/10

1. What is the percentage Nitogen content of the atmosphere

70

2. one of the followings is not a beneficial role of soil bacteria

drainage

3. What is the optimum temperature (degrees centigrade) range for bacteria that are termed mesophiles

25-35

4. Under which soil condition is Nitrogen mostly lost

poorly aerated soils

5. The following activities of soil organisms are beneficial to plants except one

soil aggregation

6. Earth worms thrive best under which type of condition of soil

acid soil

7. Nematodes are mainly pathogenic to some crops

all of the above

8. One of the followings is not an important role of soil organisms

Drainage

9. Termite mount contain higher amounts of the following soil nutrients except one

Na

10. Morphologically, true algae has the following features except one

filaments