Dams and canal networks developed for irrigation purposes in Pakistan and may other countries create the problem of:

Related Mcqs:

1. With the construction of Thal irrigation canal, about _____ sand dunes have been converted into highly productive cultivated areas:

   A. 1 m ha
   B. 2 m ha
   C. 3 m ha
   D. 4 m ha

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

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

3. In Pakistan Tarbela, Mangla and Warsak dams are the main:

   A. Hydro-electric power plants
   B. Nuclear power plants
   C. Thermal power plants
   D. Power plants

4. Bunds, dams and drains are constructed to prevent:

   A. Stream bank erosion
   B. Sheet erosion
   C. Slip erosion
   D. Gully erosion

5. In Pakistan about ________ area is arid or semi arid and agriculture is not possible without irrigation:

   A. 40%
   B. 50%
   C. 60%
   D. 70%

6. The important features of evaluation of site for plantation purposes are:

   A. Geomorphology
   B. Soil features
   C. Hydrologic features
   D. Vegetation features
   E. All of the above

7. Tillage Method: A farmer ploughs for purposes:

   A. Preparation of seed beds for established of plants
   B. To eliminate weed competition
   C. To replace soil layer by fresh layer soil
   D. All of the above

8. Reclamation of dry sites without irrigation is / are:

   A. General considerations
   B. Species for dry zone reclamation
   C. Site preparation
   D. None of these

9. Of the ________ million ha area under cultivation, 15.62 million ha area (76%) is under irrigation:

   A. 21
   B. 22
   C. 23
   D. 24

10. Sometimes sound and uninjured seeds may fail to germinate due to reduced activity of the seed or seed parts resulting in blockade of the growth. This may be due to:

    A. External effects of environment
    B. Internal conditions within the plant itself, i.e. Embryo dormancy or seed coat dormancy
    C. Both (a) & (b)
    D. None of these