79) In India, which of the following crops is the largest consumer of irrigation waters?

80) Which one among the following covers the highest percentage of forest area in the world?

81) Pink bollworm is a pest of -

82) Tornadoes (or andhis)are common in Punjab and haryana. The same are called _____ in west bengal.

83) With biotic succession in a lake environment the population and diversity of plants and animals: