Shifting cultivation by man causes is / are:

Related Mcqs:

1. What is the best pH of soil for cultivation?

   A. 3.8-5.4
   B. 6.5-7.5
   C. 4.5-8.5`
   D. 5.5-6.5

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

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

3. The most common method used for cultivation on hills:

   A. Levelling
   B. Ridge terracing
   C. Bench terracing
   D. Channel terracing

4. Forest fires cause millions of rupee of damage each year to the forest. Within the span of a few hours, hard work of generations of forest officers can be ruined. Causes of fires is / are :

   A. Burning of grass and undergrowth along patches frequented by villagers for easy passage
   B. Burning to facilitate the collection of minor produce
   C. Burning of grass by graziers for the sake of the tender grass, which comes up after a fire
   D. Fires caused by sparks from locomotive engines passing through the forest
   E. All of the above

5. Causes of plant succession are:

   A. Environmental changes produced as a result of reaction to the community become favorable for new species of plants
   B. Physiographic factors produce change in the habitat like flooding of plains, soil erosion, change in temperature, rain etc.
   C. Both (a) & (b)
   D. None of these

6. The causes of loss of biological diversity are:

   A. Over hunting is perhaps the most obvious direct cause of extinction in animals, as it has affected several large and well-known species
   B. Genetic diversity as represented by genetic differences between discrete populations with wild species, is liable to reduction as result of the same factors affecting species
   C. A major, though at present largely unpredictable, change in natural environments is likely to occur within the next century as a result of large-scale changes in global climate and weather patterns
   D. All of the above

7. Mercury pollution causes a disease:

   A. Methaelo binemia
   B. Minamata
   C. Foolish disease
   D. Hepatitis

8. Deforestation causes:

   A. Soil erosion
   B. Pollution
   C. No floods
   D. None of these

9. What are causes of shakes?

   A. To Kochler (1933), due unbalanced growth stresses or forces
   B. They may develop as a result of heavy frost
   C. Both (a) & (b)
   D. None of these

10. What is the causes of abnormal wood (CW/TW)?

    A. To Evarts and Mason (106) it is due to gravity
    B. Metzger (1908) says it is due to tension and compression
    C. Wersking and Baily, due to (1942) increase or decrease in plant hormones
    D. Philips says (1940), it is due to wind
    E. All of the above