2501: The major ingredient of leather is:
(a) Collagen
(b) Polymer
(c) Carbohydrate
(d) Nucleic acid
2502: Which of the following fertilisers leaves acidic residue?
(a) Ammonium phosphate
(b) Ammonium sulphate
(c) Urea
(d) Sulphate of potash
2503: Unit of distance used in navigation is:
(a) Nautical mile
(b) Kilometre
(c) Light year
(d) Yard
2504: Human Poverty Index was introduced in the Human Development Report of the year
(a) 1994
(b) 1995
(c) 1996
(d) 1997
2505: Which one of the following is monogamous?
(a) Wolf
(b) Walrus
(c) Seal
(d) Deer