UPSC Government Jobs Exams

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

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UPSC Other Question
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 The phenomenon of radioactivity was discovered by [UPSC 2008]

Madam Curie
J.J. Thomson
Roentgen
Becquerel