Which one of the following pairs (Crop - Peculiarity) is not correctly matched?

1. A

   State where rice is grown three times in a year – West Bengal

   Option (a) claims that West Bengal is the state where rice is grown three times in a year, which is correct as the state cultivates Aus, Aman, and Boro paddy crops annually. This option is not the key because the question asks for the incorrectly matched pair.

2. B

   Bihar's contribution to rice production – 15.7%

   Option (b) claims that Bihar's contribution to India's total rice production is 15.7%, which is factually incorrect as Bihar's actual share is significantly lower, around 5 to 6 percent. This option serves as the official key because it represents the mismatch requested by the question.

3. C

   State with largest area under rice production – Uttar Pradesh

   Option (c) claims that Uttar Pradesh is the state with the largest area under rice production in India, which is accurate as UP consistently records the highest acreage for paddy cultivation. This option is not the key since the pair is correctly matched.

4. D

   Isohyets that decide western limit of rice production – 100 cm

   Option (d) claims that the 100 cm isohyet decides the western limit of rice production in the country, which correctly describes the climatic boundary for rainfed paddy cultivation. This option is not the key as the statement is factually true.

Summary. Official key is (b) because Bihar's actual contribution to national rice production is much lower than the 15.7% claimed in the option. Option (a) correctly identifies West Bengal for growing three rice crops a year. Option (c) accurately points to Uttar Pradesh as having the largest area under rice cultivation. Option (d) correctly notes the 100 cm isohyet as the western climatic boundary for rice. Thus, only option (b) contains the factual error required by the question.