Leaf curling is caused by:

Related Mcqs:

1. 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

2. The temperate broad-leaf forest biomes are characterized by the predominance of

   A. Cupressus sp.
   B. Dalbergia sp.
   C. Diospyros sp.
   D. Quercus sp.

3. Which adaptation is seen in the leaf insect?

   A. Migration
   B. Camouflaging
   C. Batesion mimicry
   D. Mullerian mimicry

4. Dominant tree: Including all trees which form the upper most leaf canopy and have their leading shoots free. These are usually sub-divided into:

   A. Predominant trees comprising all the largest trees which determine the general top level of the canopy
   B. Codominant trees which fall short of this, averaging about 5/6th of the height of predominant
   C. Trees with forked leader and similar defects
   D. All of the above

5. Phosphate pollution is caused by:

   A. Phosphate rock only
   B. Agricultural fertilizers only
   C. Sewage and phosphate rock
   D. Sewage and agricultural fertilizers

6. Minimata disease was caused due to the consumption of:

   A. Sea food containing lot of cadmium
   B. Fish contaminated with mercury
   C. Oysters with lot of pesticide
   D. Sea food contaminated with selenium

7. The soil pollution is caused as the industrial furnaces throw:

   A. CFC, CH4 and SO2
   B. Sulphates of Na, Ca and Fe
   C. Fly ash
   D. All of these

8. The percentage of air pollution caused due to smoke:

   A. 10-15%
   B. 15-20%
   C. 20-25%
   D. 2-5%

9. The ‘blue baby syndrome’ is caused due to pollution by:

   A. Chlorides
   B. Cyanides
   C. Fluorides
   D. Nitrates

10. Water pollution is caused by:

    A. Decay of bodies of aquatic organisms
    B. Rain
    C. Growth of phytoplankton
    D. Industrial effluents