Which of the following statements is NOT correct?
• [(A).] Seeds of synthetic varieties need to be replaced every year.
• [(B).] Hybrid crops need intensive care and more inputs.
• [(C).] Open pollinated progeny test is used in Maize and Pearl millet.
• [(D).] Composite varieties exploit both GCA and SCA. Choose the correct answer from the options given below:
Which of the following statements is NOT correct?
• [(A).] Seeds of synthetic varieties need to be replaced every year.
• [(B).] Hybrid crops need intensive care and more inputs.
• [(C).] Open pollinated progeny test is used in Maize and Pearl millet.
• [(D).] Composite varieties exploit both GCA and SCA. Choose the correct answer from the options given below:
Show Hint
- Hybrids exploit SCA and their seeds must be replaced every year.
- Synthetics and Composites exploit GCA and their seeds can be saved for 3--4 years.
- (A), (B) and (C) only.
- (A), (B) and (D) only.
- (A), (C) and (D) only.
- (B), (C) and (D) only.
The Correct Option is C
Solution and Explanation
Cross-pollinated crops (such as maize and pearl millet) are improved using several breeding approaches, including hybrids, synthetics, and composites.
Each has unique genetic properties, seed production requirements, and testing protocols.
Step 3: Detailed Explanation:
Let us analyze each statement to determine which are NOT correct:
- Statement (A) is NOT correct: Unlike \(F_1\) hybrids, which suffer severe yield loss if seed is saved and replanted, synthetic varieties are open-pollinated populations with high heterozygosity.
Farmers can save and replant synthetic seeds for 3 to 4 generations without a significant drop in yield, so they do not need to be replaced every year.
- Statement (B) is correct: Hybrids are highly responsive and require optimal irrigation and fertilizer inputs to fully express their high yield potential.
- Statement (C) is NOT correct: In maize and pearl millet breeding, breeders do not rely on simple open-pollinated progeny tests due to the lack of control over the pollen source.
Instead, they use topcrosses or selfed-progeny (\(S_1\) or \(S_2\)) evaluations to determine combining ability.
- Statement (D) is NOT correct: Composite varieties are developed by mixing seeds of open-pollinated lines that perform well in General Combining Ability (GCA).
They do not specifically exploit Specific Combining Ability (SCA), which requires controlled single crosses (as in \(F_1\) hybrids).
Therefore, statements (A), (C), and (D) are incorrect.
Step 4: Final Answer:
The statements that are NOT correct are (A), (C), and (D), matching Option (C).
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Choose the correct answer from the options given below:
Which of the following statements about synthetic varieties are correct?
• [(A).] Unlike hybrids, the farmers can save the seeds of synthetic varieties.
• [(B).] Synthetic varieties have wider adaptability.
• [(C).] No need to make fresh crosses every year.
• [(D).] Synthetic varieties are higher yielding than the hybrids.
Choose the correct answer from the options given below:
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