The correct answer to the question is option-1, Kazakhstan. Baikonour cosmodrome is located in Kazakhstan, which is a country in Central Asia. The Baikonour cosmodrome is one of the most famous and significant space launch facilities in the world. It has been in operation since 1955 and has played a crucial role in Soviet and Russian space exploration.
Option-2, Tajikistan, is incorrect. Tajikistan is a neighboring country to Kazakhstan, but it does not house the Baikonour cosmodrome.
Option-3, Uzbekistan, is also incorrect. While Uzbekistan is also a neighboring country to Kazakhstan, it is not the location of the Baikonour cosmodrome.
Option-4, Turkmenistan, is also incorrect. Turkmenistan is yet another neighboring country to Kazakhstan, but it is not where the Baikonour cosmodrome is situated.
In conclusion, the Baikonour cosmodrome is located in Kazakhstan, making option-1 the correct answer to the question.