Relative biological effectiveness (RBE) is usually referred to damages caused by:

Related Mcqs:

1. Various kinds of damages caused by man to forests are:

   A. Illicit removal of forest produce from the forest
   B. Encroachments
   C. Irregularities in the management and exploitation of forests
   D. Forest Fires
   E. All of the above

2. Humidity – except for about 64 km inland coastal belt, where values of the relative humidity are the highest, especially during summer season with August as a humid month, the relative humidity in most part of the country is moderate, falling below _____ in the plains:

   A. 10%
   B. 15%
   C. 20%
   D. 25%

3. Forest damages is / are:

   A. By freezing or chilling to death young weedy plants or young organs of plants
   B. By splitting the stems of trees
   C. By causing canker in stems of trees
   D. By uprooting young plants
   E. All of the above

4. Extent of damages means:

   A. Intensity of fire and its duration
   B. Type of vegetation
   C. Intensity and time of precipitation
   D. All of the above

5. Control measures to check tree damages are:

   A. Use of resistant varieties
   B. Physical
   C. Biotechnical
   D. Biological
   E. All of the above

6. Plant damages are:

   A. Biotic effect
   B. Abiotic effect
   C. Both (a) & (b)
   D. None of these

7. 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

8. One of the major difficulties in the biological control of insect pests is that:

   A. The predator develops a preference to other diets and may itself become a pest
   B. They do not always survive when transferred to a new environment
   C. The method is less effective as compared to the use of insecticides
   D. The practical difficulty in introducing the predator to specific area

9. Biological equilibrium is found among the:

   A. Producers and consumers
   B. Producers and decomposers
   C. Producers, consumers and decomposers
   D. Producers and light

10. Among the plants listed, point out one that does not fit into biological group represented by other plants

    A. Euphorbia
    B. Acacia
    C. Vallisneria
    D. Aloe