QUES: In the 19th century, the city was transformed by development relating to its status as a trading center, as well as by European immigration. The city adopted the Commissioners' Plan of 1811, which expanded the city street grid to encompass all of Manhattan. The 1825 completion of the Erie Canal through central New York connected the Atlantic port to the agricultural markets and commodities of the North American interior via the Hudson River and the Great Lakes. Local politics became dominated by Tammany Hall, a political machine supported by Irish and German immigrants.

What plan of 1811 spread a grid of streets across Manhattan?
What is the answer?
ANS: Commissioners' Plan
QUES: The discipline of plant ecology was pioneered in the late 19th century by botanists such as Eugenius Warming, who produced the hypothesis that plants form communities, and his mentor and successor Christen C. Raunkir whose system for describing plant life forms is still in use today. The concept that the composition of plant communities such as temperate broadleaf forest changes by a process of ecological succession was developed by Henry Chandler Cowles, Arthur Tansley and Frederic Clements. Clements is credited with the idea of climax vegetation as the most complex vegetation that an environment can support and Tansley introduced the concept of ecosystems to biology. Building on the extensive earlier work of Alphonse de Candolle, Nikolai Vavilov (18871943) produced accounts of the biogeography, centres of origin, and evolutionary history of economic plants.

What history did Vavilov write about?
What is the answer?
ANS: history of economic plants
QUES: On January 17, 1961, Eisenhower gave his final televised Address to the Nation from the Oval Office. In his farewell speech, Eisenhower raised the issue of the Cold War and role of the U.S. armed forces. He described the Cold War: "We face a hostile ideology global in scope, atheistic in character, ruthless in purpose and insidious in method ..." and warned about what he saw as unjustified government spending proposals and continued with a warning that "we must guard against the acquisition of unwarranted influence, whether sought or unsought, by the militaryindustrial complex."

On what date did Eisenhower deliver his farewell speech?
What is the answer?
ANS:
January 17, 1961