Plants die from prolonged water logging because:

Related Mcqs:

1. Water-logging is a serious problems, with water-table within _____ over the greater part of the area:

   A. 5m
   B. 6m
   C. 7m
   D. 8m

2. Water logging occurs:

   A. In sandy soil
   B. On gravels
   C. In loamy soil
   D. In clay soil

3. Logging means:

   A. It is an operation comprising felling of trees, limbing, bucking and transportation of the resulting product out of forest to the point of its end use
   B. It is process of watering the forest
   C. Both (a) & (b)
   D. None of these

4. Logging is effected by:

   A. Terrain
   B. Lean of trees
   C. Defect
   D. Wind fallen trees
   E. All of the above

5. Those chemicals which are produced by plants and affect other plants are broadly called:

   A. Depresants
   B. Allomones
   C. Allelochemics
   D. Kairomones

6. Among the plants listed, point out one that does not fit into ecological group represented by the other plants:

   A. Acacia
   B. Aloe
   C. Euphorbia
   D. Rhizophora

7. Among the plants listed, point out one that does not fit into biological group represented by other plants

   A. Euphorbia
   B. Acacia
   C. Vallisneria
   D. Aloe

8. Prolonged liberal irrigation of agricultural fields is likely to create the problem of:

   A. Acidity
   B. Metal toxicity
   C. Aridity
   D. Salinity

9. The non-green plants are as important as the green plants because they:

   A. Cause human disease
   B. Cause diseases of other plants
   C. Are useful in several industries
   D. Bring about decomposition of dead animals and plant remains

10. In water logged soil plants cannot grow properly because the soil is:

    A. Physiologically wet
    B. Physiologically dry
    C. Physically dry
    D. None of the above