Question:
Preceding crop requirement is an essential consideration during seed production to minimize the chances of genetic contamination through-
Preceding crop requirement is an essential consideration during seed production to minimize the chances of genetic contamination through-
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Preceding crop requirement is a "land standard" specifically aimed at avoiding "volunteer plants." Memorizing this direct association is highly helpful for seed certification questions.
Updated On: Aug 13, 2026
- Pollen shedders
- Volunteer plants
- Objectionable weeds
- Mutants
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Preceding crop requirement is a crucial land standard in seed certification.
It specifies that a seed crop must not be grown on land where the same crop (or a different variety of the same crop) was grown in the immediate previous season.
Step 2: Detailed Explanation:
The primary biological objective of the preceding crop requirement is to prevent the growth of volunteer plants.
Volunteer plants are plants that grow naturally on the land without being intentionally sown.
They arise from seeds that shattered, spilled, or remained dormant in the soil from the previous crop harvest.
If a different variety of the same crop was grown in the previous season, these volunteer plants will grow alongside the new seed crop.
This leads to severe genetic contamination via cross-pollination (especially in cross-pollinated and often cross-pollinated crops) and physical contamination during harvest.
Therefore, enforcing a preceding crop requirement (such as requiring a fallow period, or planting a completely unrelated crop in the previous season) is essential to eliminate volunteer plants.
Let us review other options:
- Pollen shedders (A) are male-fertile plants occurring in male-sterile lines in hybrid seed production. They are genetic impurities but are not directly caused by soil seed carryover.
- Objectionable weeds (C) are highly undesirable weed species whose seeds are hard to separate, but their control is managed through herbicide applications and roguing, not solely by preceding crop rules.
- Mutants (D) arise from spontaneous DNA changes and are unrelated to land history.
Step 3: Final Answer:
Preceding crop requirements are implemented to minimize genetic contamination through volunteer plants.
Therefore, the correct option is (B).
Preceding crop requirement is a crucial land standard in seed certification.
It specifies that a seed crop must not be grown on land where the same crop (or a different variety of the same crop) was grown in the immediate previous season.
Step 2: Detailed Explanation:
The primary biological objective of the preceding crop requirement is to prevent the growth of volunteer plants.
Volunteer plants are plants that grow naturally on the land without being intentionally sown.
They arise from seeds that shattered, spilled, or remained dormant in the soil from the previous crop harvest.
If a different variety of the same crop was grown in the previous season, these volunteer plants will grow alongside the new seed crop.
This leads to severe genetic contamination via cross-pollination (especially in cross-pollinated and often cross-pollinated crops) and physical contamination during harvest.
Therefore, enforcing a preceding crop requirement (such as requiring a fallow period, or planting a completely unrelated crop in the previous season) is essential to eliminate volunteer plants.
Let us review other options:
- Pollen shedders (A) are male-fertile plants occurring in male-sterile lines in hybrid seed production. They are genetic impurities but are not directly caused by soil seed carryover.
- Objectionable weeds (C) are highly undesirable weed species whose seeds are hard to separate, but their control is managed through herbicide applications and roguing, not solely by preceding crop rules.
- Mutants (D) arise from spontaneous DNA changes and are unrelated to land history.
Step 3: Final Answer:
Preceding crop requirements are implemented to minimize genetic contamination through volunteer plants.
Therefore, the correct option is (B).
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