76: The varieties of corn can be improved by which of the following methods?
(a) Dihybrid cross
(b) Back cross
(c) Double cross
(d) Natural selection
77: With reference to colonial period of Indian history, match List I (Person) with List II (Event) and select the correct answer using the codes given below the lists :
List I-------------List II
(Person)----------(Event)
A. MacDonald-----1. Doctrine of Lapse
B. Linlithgow------2. Communal Award
C. Dalhousie------3. August Offer
D. Chelmsford-----4. Dyarchy
Codes:
A B C D
(a) 3 2 1 4
(b) 3 2 4 1
(c) 2 3 1 4
(d) 2 3 4 1
78: Human activities in the recent past have caused the increased concentration of carbon dioxide in the atmosphere, but a lot of it does not remain in the lower atmosphere because of
1. Its escape into the outer strato-sphere.
2. The photosynthesis by phyto-plankton in the oceans.
3. The trapping of air in the polar ice caps
Which of the statements given above is/are correct?
(a) 1 and 2
(b) 2 only
(c) 2 and 3 only
(d) 3 only
79: Which one of the following reflects back more sunlight as compared to other three ?
(a) Sand Desert
(b) Paddy crop land
(c) Land covered with fresh snow
(d) Prairie land
80: Which one of the following suggested the reconstitution of the Viceroy's Executive Council in which all the portfolios including that of War Members were to be held by the Indian leaders?
(a) Cripps Proposal
(b) Simon Commission
(c) Shimla Conference
(d) Cabinet Mission