Question

Majority of the high yielding varieties of Indian rice have been developed by cross between

• A. Oryza sativa japonica and Oryza sativa indica
• B. Oryza sativa indica and Oryza nivara
• C. Oryza nivara and Oryza sativa japonica
• D. Oryza nivara and Oryza rufipogon

Answer 1

Answer: (A)

Plant breeding is a technique used by agricultural scientist and botanist across the world for creation of varieties of plants and trees. While, this is a manipulation of plant species to get varieties with desired characteristics, this is the basics of green revolution which led to the development of high yielding varieties of rice, wheat and other crop plants. A majority of the high yielding rice varieties were derived by cross breeding of various species of japonicas and indicas since 1960 e.g., Oryza sativa japonica and Oryza sativa indica.

Therefore, the correct answer is option A.