Which among the following is the most suitable common word for roaring forties, furious fifties and stormy sixties ?

The top three largest produced oilseeds in India are__:

Consider the following statements:

1. While PM (particulate matter) and Nitrous oxides (NOx) are more prevalent in a diesel engine, Hydrocarbons and Carbon monoxide are more prevalent in petrol engines.
2. While use of catalytic convertor in an engine reduces emission of carbon monoxide and nitrous oxides, but it increases the emission of carbon dioxide

Which of the above statements is/are correct?

Consider the following statements about Intensive agriculture:

1. More than one type of crop is raised on the same field
2. Vegetables and cereals are most commonly grown in this type of agriculture
3. Farm size is small but yield per unit area is high

Which of the above statements is/are correct?

Consider the following pairs:
1. Asiatic Lion - Gir National Park
2. Rhinoceros - Kaziranga National Park
3. Hangul - Corbett National Park
4. Lion tailed Macaque - Western Ghats
Which among the above is / are correct matches?