Land covers about ______ of the earth's surface.
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Why do the plant closes stomata when it does NOT need carbon dioxide for photosynthesis?
∆DEF is right angled at E. If tanD = 4/3, then what is the value of tanF ?
ΔXYZ is right angled at Y. If cosX = 3/5, then what is the value of cosecZ ?
What is the simplified value of (cos A + sin A)(cot A + tan A)?
Which of the following Sultans of Tughlaq dynasty issued copper coins instead of silver ones?
Ashoka was an emperor of the __________ Dynasty.
Who invented Vacuum Flask?