The injuries are generally caused by:

Related Mcqs:

1. Injuries by diseases is / are:

   A. Throughout their life
   B. Seeds decay and seedlings are killed by damping-off
   C. Generally serious in the coniferous nurseries
   D. All of the above

2. Injuries by insects is / are:

   A. An essential part of the forest ecosystem
   B. Some are beneficial; quite a few are serious pests of trees and wood products
   C. Tonica inviferana, a semal shoot borer, Ascotis imparata,
   D. A bakain defoliator and Margaronia phloalis a defoliator of mulberry are serious pests of other tree species grown in forest plantations
   E. All of the above

3. What are kinds of frost injuries?

   A. Frost rings: are dark brownish lines within the growth rings as a result of injury to the cambium due to the heavy frost
   B. Frost cracks: to the very much low temperature, the cracks appear at the basal portion of old trees
   C. Both (a) & (b)
   D. None of these

4. Frost injuries are:

   A. Heavy frost
   B. Heavy low temperature
   C. Both (a) & (b)
   D. None of these

5. The air pollution caused by phosphate fertilizer factories is due to:The air pollution caused by phosphate fertilizer factories is due to:

   A. Phosphene
   B. SiF4
   C. Dust
   D. Halogens

6. The extent of darkness caused due to smoke can be determined by the help of:

   A. Smoke filters
   B. Ringelmann’s charts
   C. Horizontal microscopes
   D. All of these

7. Atmospheric pollution is also caused by the gas:

   A. Phosphene
   B. Nitrogen
   C. Hydrogen
   D. Nerve gas VX

8. Air pollution is caused by:

   A. Automobile exhausts
   B. Radioactive substances
   C. Smoke
   D. All of the above

9. Acid rain is mainly caused by increased concentration (in atmosphere) of:

   A. Ozone and dust
   B. NH3 and SO3
   C. CO and SO3
   D. NO2 and SO2

10. Sheet erosion is caused by:

    A. Fast running rivers
    B. Wind
    C. Heavy rains
    D. Glaciers