When DDT was applied in an orchard as a pesticide, the fruit production decreased. This happened because:

Related Mcqs:

1. It is advised not to have brick kiln near fruit orchard:

   A. To save the trees from erosion
   B. To safeguard the fruits from large labour population
   C. To save the trees from poisonous fumes/smoke from the brick chimneys
   D. To protect the orchard from the operation of trucks meant for transporting fruits

2. The major drawback of DDT as a pesticide is that:

   A. Its cost of production is high
   B. It is not rapidly degraded in nature
   C. Organisms at once developed resistance to it
   D. It is significantly less effective than other pesticides

3. Biological control component is central to advanced agriculture production. Which of the following is used as a third generation pesticide?

   A. Pathogens
   B. Pheromones
   C. Insect repellant
   D. Insect hormone analogue

4. What is meant by seed orchard?

   A. For a long time it was held that the quality of future plants depends primarily upon the quality of the seed
   B. Starting from this statement more and more attention was paid to the production of seeds of good quality
   C. Both (a) & (b)
   D. None of these

5. Seed orchard means:

   A. It is plantation or group of good quality trees, which are purposely raised for the production of good quality seed
   B. The spacing is kept very wide in order to enable to tree to freely spread its crown so that flowering and fruiting is healthy and early.
   C. Both (a) & (b)
   D. None of these

6. Spraying of DDT on crops produces pollution of

   A. Soil and water
   B. Air and soil
   C. Crops and air
   D. Air and water

7. DDT is a:

   A. Biodegradable pollutant
   B. Green house gas
   C. Non-degradable pollutant
   D. None of the above

8. Spraying of DDT on crop produces pollution of:

   A. Air only
   B. Air and soil only
   C. Air, soil and water
   D. Air and water only

9. The maximum biological magnification of DDT through food web is seen in:

   A. Algae
   B. Bacteria
   C. Higher plants
   D. Man

10. Which of the following is likely to have the highest level of DDT deposition in its body?

    A. Eel
    B. Crab
    C. Sea gull
    D. Phytoplanktons