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Zeenath PV asked:
why earth moves in an elliptical orbit instead of circular one?
So, it is more general way of saying that the orbits are elliptical. If it were circular, we would have more trouble explaining why they are perfect circles.
The situation where the Sun, for instance, would be exactly in the center of a perfectly circular planetary orbit couldn’t happen in our Solar System since there are other planets that would gravitationally affect the orbit and cause it to be immediately non-circular by pulling the object to one side or the other. Any other stable orbit type than a perfectly circular one turns out to be an elliptical orbit.
Read more at : http://www.astro-tom.com/technical_data/why_elliptical.htm
Zeenath PV asked: how earths tilt causes seasonal change?
The climate on earth is mainly determined by the distance from sun and how much sunlight (and heat radiations) is received by earth. The relative duration of day and night as well as the climate is greatly dependant on the tilt of the earth’s axis with respect to its plane of orbit around sun and the elliptical shape of earth
Please follow these links to read more: