Questions

Given total number of rats = 999919

999919 = 1000000 - 81 = 10002 - 92 = (1000+9)(1000-9) = 1009 x 991.
Since there were more rats than there were cats, 991 cats killed 1009 rats each.

Mediterranean agriculture is practised  on  the  either  side  of  the Mediterranean  Sea  in  Europe  and in   north   Africa   from   Tunisia   to Atlantic  coast,  southern  California, central  Chile,  south  western  parts of   South   Africa   and   south   and south  western  parts  of  Australia. This region is an important supplier of citrus fruits. Viticulture or grape cultivation  is  a  speciality  of  the Mediterranean region.

India is the second largest producer of Rice in the World. Rice is the most cultivated crop in India.

According to 2002-2003 census, about 33 million hectares of area in India was cultivated with Rice.

Generic means related to a group of similar things rather than a particular one. It means it is not a specific thing like branded or trademarked. Hence it is a basic one.

Among the given options, Generic is most similar in meaning to Basic.

Heat lost by hot object = Heat gained by cold object

where we ignore heat gained or lost from/to the surroundings.

The study of heat gained and lost in this manner is often called Calorimetry.

Polyglot - A person who knows or speaks many languages.

Linguist - A person who speaks  foreign languages.