The major drawback of DDT as a pesticide is that:

Related Mcqs:

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

   A. DDT is a growth retardant
   B. DDT disturbed hormonal balance essential for fruit setting
   C. DDT killed the pollinating insects along with the pests
   D. DDT inhibited flowering

2. The use DDT is banned now a days because it is:

   A. Very costly
   B. Not available
   C. Inflammable
   D. Not degraded easily

3. Spraying of DDT on crops produces pollution of

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

4. DDT is a:

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

5. 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

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

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

7. 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

8. 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

9. Every pesticide develops its own failure as its repeated use leads to:

   A. The development of resistant pest varieties
   B. Simplification of food web
   C. Reduction in population of useful birds
   D. Increase in weed population

10. Which of the following is not a commonly used pesticide?

    A. Aldrin
    B. Lindane
    C. Chlordane
    D. Chloremphenicol