QUES: While some birds are essentially territorial or live in small family groups, other birds may form large flocks. The principal benefits of flocking are safety in numbers and increased foraging efficiency. Defence against predators is particularly important in closed habitats like forests, where ambush predation is common and multiple eyes can provide a valuable early warning system. This has led to the development of many mixed-species feeding flocks, which are usually composed of small numbers of many species; these flocks provide safety in numbers but increase potential competition for resources. Costs of flocking include bullying of socially subordinate birds by more dominant birds and the reduction of feeding efficiency in certain cases.
What are the principal benefits of flocking?

ANS: safety in numbers and increased foraging efficiency

QUES: According to Archibald Sayce, the primitive pictograms of the early Sumerian (i.e. Uruk) era suggest that "Stone was scarce, but was already cut into blocks and seals. Brick was the ordinary building material, and with it cities, forts, temples and houses were constructed. The city was provided with towers and stood on an artificial platform; the house also had a tower-like appearance. It was provided with a door which turned on a hinge, and could be opened with a sort of key; the city gate was on a larger scale, and seems to have been double. The foundation stones or rather bricks of a house were consecrated by certain objects that were deposited under them."
Where were towers built from stone?

ANS: unanswerable

QUES: Nigeria's foreign policy was tested in the 1970s after the country emerged united from its own civil war. It supported movements against white minority governments in the Southern Africa sub-region. Nigeria backed the African National Congress (ANC) by taking a committed tough line with regard to the South African government and their military actions in southern Africa. Nigeria was also a founding member of the Organisation for African Unity (now the African Union), and has tremendous influence in West Africa and Africa on the whole. Nigeria has additionally founded regional cooperative efforts in West Africa, functioning as standard-bearer for the Economic Community of West African States (ECOWAS) and ECOMOG, economic and military organisations, respectively.
Nigeria is a 'standard-bearer' in what international group?

ANS: the Economic Community of West African States

QUES: The top 10 contestants started with five males and five females, however, the males were eliminated consecutively in the first five weeks, with Lazaro Arbos the last male to be eliminated. For the first time in the show's history, the top 5 contestants were all female. It was also the first time that the judges' "save" was not used, the top four contestants were therefore given an extra week to perform again with their votes carried over with no elimination in the first week.
How many contestants did this season have?

ANS:
10