Match List-I with List-II
List-I (Name of crop) & List-II (Cytoplasm/Gene used)
(A) Rice & (I) Tift 23A
(B) Wheat & (II) Norin 10
(C) Maize & (III) Dee-geo-woo-gen
(D) Pearl millet & (IV) CMS-T
List-I (Name of crop) & List-II (Cytoplasm/Gene used)
(A) Rice & (I) Tift 23A
(B) Wheat & (II) Norin 10
(C) Maize & (III) Dee-geo-woo-gen
(D) Pearl millet & (IV) CMS-T
Show Hint
- (A) - (IV), (B) - (II), (C) - (III), (D) - (I)
- (A) - (III), (B) - (II), (C) - (IV), (D) - (I)
- (A) - (IV), (B) - (II), (C) - (I), (D) - (III)
- (A) - (III), (B) - (IV), (C) - (I), (D) - (II)
The Correct Option is B
Solution and Explanation
Modern plant breeding programs utilize specific dwarfing genes or cytoplasmic male sterility (CMS) sources to develop high-yielding, semi-dwarf, or hybrid varieties of staple crops.
Step 2: Detailed Explanation:
Let us pair each crop with its corresponding gene or cytoplasm source:
- (A) Rice $\rightarrow$ (III) Dee-geo-woo-gen:
'Dee-geo-woo-gen' is a famous dwarf, early-maturing indica rice variety from Taiwan. It provided the *sd-1* gene, which was used to breed high-yielding, semi-dwarf rice varieties like IR8, launching the Green Revolution in rice.
- (B) Wheat $\rightarrow$ (II) Norin 10:
'Norin 10' is a Japanese semi-dwarf wheat variety that contained the *Rht1* and *Rht2* dwarfing genes. Dr. Norman Borlaug incorporated these genes into spring wheat, developing the semi-dwarf wheat varieties that drove the Green Revolution.
- (C) Maize $\rightarrow$ (IV) CMS-T:
The Texas cytoplasmic male sterile (CMS-T) cytoplasm was widely used in the USA during the mid-20th century to produce hybrid maize seeds without manual detasseling.
- (D) Pearl millet $\rightarrow$ (I) Tift 23A:
'Tift 23A' is a cytoplasmic-genetic male sterile line developed in Tifton, Georgia, which served as the primary maternal parent for breeding the first generation of commercial pearl millet hybrids in India (such as HB-1).
Matching these pairs gives: (A)-(III), (B)-(II), (C)-(IV), (D)-(I).
Step 3: Final Answer:
The correct matching sequence is (A) - (III), (B) - (II), (C) - (IV), (D) - (I).
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