4016: When a person moves from poles to the equator, the population of plants and animals will:
(a) Increase
(b) Decrease
(c) Remain unchanged
(d) Not show any consistent behaviour
4017: Where is Bundala Bioshpere Reserve which has been recently added to the UNESCO's Man and Biosphere (MAB) network, located?
(a) Russia
(b) Bangladesh
(c) India
(d) Sri Lanka
4018: Two numbers X and Y are respectively 20% and 28% less than a third number Z. By what percentage is the number Y less than the number X ?
(A) 8%
(B) 9%
(C) 10%
(D) 12%
4019: Which one of the following is not an essential micronutrient for plants ?
(a) Boron
(b) Zinc
(c) Sodium
(d) Copper
4020: Which one of the following is used as an explosive?
(a) Nitroglycerine
(b) Phosphorus trichloride
(c) Mercuric oxide
(d) Graphite