Harmful effects can also result from:

Related Mcqs:

1. The most harmful effect of ionising radiations precisely involves:

   A. Cell membranes
   B. DNA
   C. Mitochondria and ribosomes
   D. Nucleus

2. Most harmful heavy metals causing water pollution:

   A. Pb, Hg, Cr, Cd
   B. P,Mn,B,Mg
   C. N,K,Mo
   D. Zn,Mo,Mg,Ag

3. The most harmful pesticide is:

   A. PAN
   B. 2,4,5-T
   C. 2,4-D
   D. DDT

4. A very harmful fibrous component causing pollution an inflicting diseases of lungs in human beings:

   A. Grease
   B. Asbestos
   C. Eichhornia roots
   D. ABS micelle

5. The most harmful component of detergents causing water pollution is:

   A. Linear alkyl sulphonate
   B. Sulphates and phosphate
   C. Alkyl benzenes sulphonate
   D. None of these

6. The effect of today’s radioactive fallout will probably be more harmful to children of future generations than to children now living because:

   A. Contamination of milk supply is not cumulative
   B. Infants are more susceptible to radiation
   C. Susceptibility to radiation increases with age
   D. Mutated genes are frequently recessive

7. CO is harmful to human being because:

   A. It decreases CO2 concentration
   B. It competes O2 to combine with haemoglobin
   C. It is carcinogenic
   D. It depletes O3 layer

8. The major effects of mulches, irrespective of their composition, are attributed to:

   A. Suppression of weeds, by restricting the amount of light on the ground surface and thus hindering their germination and growth
   B. Conservation of soil, by preventing erosion
   C. Maintenance or improvement of soil structure, by eliminating or mitigating the severity of rain and wind action
   D. All of the above

9. The major effects of soil organic matter are:

   A. Soil depth
   B. Climatic situation
   C. Both (a) & (b)
   D. None of these

10. Effects/influences/functions of soil structure are:

    A. Water holding capacity
    B. Aeration
    C. Porosity
    D. Heat transfer
    E. All of the above