Number of crops grown on the same piece of land in a year and expressed in percentage is known as_______________?

A. They need very little water to grow
B. Six crops are harvested in a year
C. They are disease resistant
D. Help in nitrogen economy of nature

A. Nicolls &Heydecker (1968)
B. Kotowski (1962)
C. Baskin (1972)
D. Maguire (1962)

A. Relative humidity
B. Absolute humidity
C. Both A and B
D. non of these

A. Impaction
B. Abrasion
C. Stratification
D. Scarification

A. Certified seed
B. Basic seed
C. Pre-basic seed
D. Pure seed