PASSAGE-7
What interests many people is the possibility of finding an Earth-like planet, and many science fiction stories have been woven around the possibility of there existing a planet somewhere in the universe which is an exact replica of the Earth. There are too many variable quantities for this to be a possibility worth considering. What is possible, if planetary systems are common as they seem to be, is the existence of planets where the conditions are similar to conditions on the Earth and to which our form of lie could rapidly adapt. If life had gained a foothold on such a planet, it is possible that life closely paralleling our own planet could have developed.
What sort of conditions is necessary for life as we know it to develop? First of all of course a suitable planetary body is essential. Given this, then two vital conditions must be satisfied. The temperature must be neither too hot nor too cold, since intense heat breaks down organic molecules and severe cold prevents activity from going on. Too much short-wave radiation also upsets living organisms. The other prerequisite is a suitable atmosphere sufficiently dense to give protection from radiation and meteorites and containing oxygen and water vapour in reasonable quantities.
QUESTIONS:
1. This passage suggests that there
(A) cannot be another planet like the Earth
(B) are other planets like the Earth mentioned only in stories
(C) may be other planets like the Earth in this universe
(D) is a planet which is exactly like the Earth
2. The hypothesis about the possibility of planets parallel to the Earth gets its strength from the fact that
(A) the scientists have discovered them
(B) books have been written about them
(C) the planetary system exists
(D) many people have shown interest in it
3. The statement, “If life had gained a foothold on such a planet” means that
(A) if there is life on the planet, it would be like hours
(B) if we go there, we can develop it like this Earth
(C) even if we try, we cannot go and live there
(D) it is impossible for life to develop there
(Source: NDA I 2012 GAT Question Paper)
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