776: A universal donor has the blood group belonging to:
(a) A
(b) B
(c) O
(d) AB
777: In the grasslands, trees do not replace the grasses as a part of an ecological succession because of
(a) insects and fungi
(b) limited sunlight and paucity of nutrients
(c) water limits and fire
(d) None of the above
778: Which one of the following is printed on a commonly used fluorescent tubelight ?
(a) 220 k
(b) 273 k
(c) 6500 k
(d) 9000 k
779: Phenylketonuria is an example of an in born error of metabolism. This error refers to
(a) hormonal overproduction
(b) atrophy of endocrine glands
(c) inherited lack of an enzyme
(d) non-disjunction
780: The 1929 Session of Indian National Congress is of significance in the history of the Freedom Movement because the
(a) Attainment of Self-Government was declared as the objective of the Congress
(b) Attainment of Poorna Swaraj was adopted as the goal of the Congress
(c) Non-Cooperation Movement was launched
(d) Decision to participate in the Round Table Conference in London was taken