63.
Adoption of potato variety Kufri Chandramukhi wheat Sonalika rotation in preference of up to date (potato variety) wheat rotation is example of

66.
Match the following columns
Column I Column II
a. When MP is increasing 1. TP increase at an increasing rate
b. When MP is decreasing but more than zero 2. TP increase at an decreasing rate
c. When MP is zero 3. AP is increasing
d. When MP is more than AP 4. TP is at its maximum stage

69.
Least cost combination of inputs is achieved when

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