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Old Saturday, April 28, 2007
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Q 5 (b)

a: By climbing on other trees, they get close to the light source.
c: Vitamin D is responsible for the absorption of calcium and phosphorus in the bones.

d: At equator, the distance from the earth's center is greater than any other point of the earth's surface. Since, weight is defined as the force with which a body is attracted towards the earth's center, so greater the distance, less is the force applied. Hence, the object's weight is lightest at the earth's equator, than at poles.
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