The influences of crown on trees is:

Related Mcqs:

1. Common combinations of the agroforestry system in Pakistan are: Trees species: Agricultural crops grown with trees:

   A. Poplars: wheat / maize / turmeric / sugarcane / vegetables / fodder
   B. Eucalypts: wheat/sunflower/tomatoes/potatoes/chilies
   C. Simal: maize/sunflower/vegetables/fodder
   D. Shisham: turmeric/wheat/maize/vegetables
   E. All of the above

2. Effects/influences/functions of soil structure are:

   A. Water holding capacity
   B. Aeration
   C. Porosity
   D. Heat transfer
   E. All of the above

3. Conditions or factors which influence the crown closure is:

   A. Manner of formation of the stand
   B. Quality of soil
   C. Soil moisture
   D. All of the above

4. Degree of crown density in a forest stand is:

   A. Closed
   B. Dense
   C. Thin
   D. Open
   E. All of the above

5. Crown thinning or high thinning is:

   A. Trees are removed from the upper crown classes in order to open up the canopy
   B. It favour the development of the most promising trees of the same classes
   C. Both (a) & (b)
   D. None of these

6. General characteristics of crown are:

   A. In young age crowns are usually conical in shape but as the time passes the crown shape becomes rounded
   B. Drooping forms also occur in many species e.g. Polyalthia longifolia
   C. Both (a) & (b)
   D. None of these

7. Crown includes:

   A. Palm trees
   B. Bamboo
   C. Conifers
   D. All of the above

8. Shapes of crown serve to expose the leaves to sunlight and air. The types of crowns of tree:

   A. Conical
   B. Umbrella
   C. Spherical
   D. Columnar
   E. All of the above

9. A windbreak with 50% crown density is more effective than one of either 100% or of ______ density:

   A. 15%
   B. 20%
   C. 25%
   D. 30%

10. The best windbreaks approach is 100% crown density in the low-profile shurb, rows, and _____ density in the tall rows:

    A. 50%
    B. 60%
    C. 70%
    D. 80%