To prevent wind and water erosion, the crop is sometimes harvested in such a way that a basal stub of the plant is left behind. This phenomenon is called:

Related Mcqs:

1. The major types of wind erosion are:

   A. Siltation
   B. Soil creep
   C. Suspension
   D. All of the above

2. The factors to control of wind erosion are:

   A. The soil should be kept moist as far as possible especially in the season of windstorms. Moist soil is less vulnerable to wind erosion than dry soil
   B. Wind breaks by planting tree in rows or shelter belts of any means are effective in wind erosion
   C. Both (a) & (b)
   D. None of these

3. At present _____ of area in Pakistan is suffering from wind erosion:

   A. 30%
   B. 40%
   C. 50%
   D. 60%

4. Apart from natural timber, harvested from trees, many wood-based panel products are produced which includes:

   A. Ploywood (including blackboard)
   B. Particle board
   C. Compressed fibreboard
   D. Non-compressed fibreboard
   E. All of the above

5. Norman Borlaug, the American agricultural scientist and plant pathologist developed the high yield strains that greatly increased crop yields. He laid the groundwork for the green revolution and was awarded the Nobel Prize for Peace in ________

   A. 1970
   B. 1972
   C. 1974
   D. 1976

6. The major types of water erosion are:

   A. Splash
   B. Sheet
   C. Rill
   D. Gully
   E. None of these

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

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

8. Which of the following plants are used as wind breaks?

   A. Zizpyhus and Calotropis
   B. Dalbergia and Delonix
   C. Delonix and Albizia
   D. Morinda and Anona

9. 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

10. These are generally, but not always, developed above the birch zone and in patches, sometimes extensive, within it, probably conditioned by edaphic and biotic factors, in Kashmir, Gilgit, Chitral and Hazara. This type ascends normally to ______ or more above the sub-alpine forests and climate must be similar but more severe than in sub-alpine forests:

    A. 140 m
    B. 150 m
    C. 160 m
    D. 170 m