A yield table for any species gives the following information on per acre basis for different site qualities and at various ages of crops:

Related Mcqs:

1. Tarbela dam is being silted at ______ acre feet per year while Mangla is being silted at a rate of _____ acre feet per year due to misuse of their watershed area:

   A. 109000, 42,000
   B. 110000, 43000
   C. 115000, 44,000
   D. None of these

2. ________ is merely a modification of the uniform system where large quantities of advance growth of various ages and size even up to trees of 40 cm diameter are retained as part of the future crop:

   A. Irregular Shelterwood system
   B. Coppice system
   C. Both (a) & (b)
   D. None of these

3. Species should have which type of qualities:

   A. Species should require no elaborate method of cultivation
   B. It should be able to grow easily without any special effort
   C. Species should be tough, hardy, and tolerant of repeated cutting
   D. All of the above

4. Yield table is / are:

   A. A tabular statement of the volume
   B. Per acre and other stand data for even-aged stands of trees at different ages and site qualities
   C. Both (a) & (b)
   D. None of these

5. 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

6. From yield table we determine:

   A. Future increment of even aged crop can be from valid yield table
   B. Under stocked stands tend to approach fully stocked stands with increase in age, though more rapid growth than the latter
   C. Both (a) & (b)
   D. None of these

7. Forage yield of grass depends on soil moisture after burning. In wet areas when there is enough presipitation after burning, forage yield can be increased by ________

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

8. It has been possible to raise the yield of resin from chir pine from the existing 1.5 kg per tree to 3.5 kg on the average per tree by using the American Bark Hack method in conjunction with ______ sulfuric acid:

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

9. Species & site quality affect interval of thinning in way:

   A. Species
   B. Site quality (S.Q)
   C. Both (a) & (b)
   D. None of these

10. A complex of several species and communities in various stages of succession maintained under similar climatic conditions is known as:

    A. Biome
    B. Environmental complex
    C. Biological spectrum
    D. Biological clocks