Question

Which is world first semi dwarf, photoperiod insensitive and high yielding rice variety?

• A. Pusa RH-10
• B. Pusa Basmati-1637
• C. Pusa Basmati-1
• D. Pusa Basmati-1121

Hint:

Look for varieties that represent significant breakthroughs. "Semi-dwarf," "photoperiod insensitive," and "high yielding" are key traits of modern rice varieties, including many hybrids. Pusa RH-10 is known as a pioneering aromatic hybrid with these characteristics.

Answer 1

The Correct Option is A

The question asks to identify a rice variety that was a "world first" in combining traits: semi-dwarf stature, photoperiod insensitivity (flowering is not dependent on specific day lengths), and high yield. While the Green Revolution famously involved varieties like IR8 from IRRI possessing these traits, the options provided are all "Pusa" varieties from India. Among the given options:
Pusa RH-10 is particularly notable as it is recognized as the world's first superfine grain aromatic rice hybrid. Hybrid rice varieties are developed to be high yielding. Modern high-yielding varieties, including hybrids, are typically bred to be semi-dwarf (to prevent lodging and respond better to fertilizers) and photoperiod insensitive (for wider adaptability across seasons and regions). Therefore, Pusa RH-10 fits the description of being high yielding, and as a modern hybrid, incorporates semi-dwarf and photoperiod insensitive traits. Its distinction as a "world first" in the superfine aromatic hybrid category with these desirable agronomic traits makes it the best fit among the choices.
Pusa Basmati-1 was a significant development as an early semi-dwarf, high-yielding Basmati variety.
Pusa Basmati-1637 and Pusa Basmati-1121 are other improved Basmati varieties known for quality and yield. Given Pusa RH-10's specific global recognition as a pioneering hybrid combining aroma with high yield and modern plant architecture (semi-dwarf, photoperiod insensitive), it aligns with the question's criteria in the context of the provided Indian varieties. Pusa RH-10