UPSC Government Jobs Exams

The Himalayan Range is very rich in species diversity. Which one among the following is the most appropriate reason for this phenomenon? [UPSC 2011 (CS-P)]

It has high rainfall that supports luxuriant vegetative growth
It is a confluence of different bio-geographical zones
Exotic and invasive species have not been introduced in this region
It has less human interference

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UPSC Other Question
The function of heavy water in a nuclear reactor is to [UPSC 2011 (CS-P)]

Slow down the speed of neutrons
Increase the speed of neutrons
Cool down the reactor
Stop the nuclear reaction The jet aircrafts fly very easily and smoothly in the lower stratosphere. What could be the appropriate explanation? [UPSC 2011 (CS-P)]
1. There are no clouds or water vapour in the lower stratosphere.
2. There are no vertical winds in the lower stratosphere.
Which of the statements given above is/are correct in this context?

1 only
2 only
Both 1 and 2
Neither 1 nor 2