Question:
The isolation distance for seed production in case of papaya through open pollination is
The isolation distance for seed production in case of papaya through open pollination is
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Highly cross-pollinated crops like Papaya and Cole crops require the highest isolation distances (up to 1.6 to 3 km) in seed production.
Updated On: Aug 13, 2026
- 1 Km
- 2 Km
- 3 Km
- 5 Km
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Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Isolation distance is the minimum required distance between two varieties of the same crop (or between the crop and a wild relative) to prevent genetic contamination through cross-pollination. This is a critical parameter in seed production to ensure the genetic purity and "trueness-to-type" of the produced seeds.
Step 2: Detailed Explanation:
Papaya (Carica papaya) is a highly cross-pollinated crop. Pollination is primarily carried out by insects (like bees and moths) and sometimes by wind. Because papaya can be dioecious (separate male and female plants), gynodioecious (female and hermaphrodite plants), or monoecious, the risk of outcrossing with neighboring plantations is extremely high.
For the production of foundation and certified seeds through open pollination, the Indian Minimum Seed Certification Standards (IMSCS) prescribe a very large isolation distance due to the long-range movement of insect pollinators and the airborne nature of the light pollen grains.
An isolation distance of 3 Km (3000 meters) is maintained for papaya seed production plots. This distance acts as a buffer to ensure that no foreign pollen from undesirable or different papaya varieties reaches the mother plants in the seed production block. In the absence of such a distance, the resulting seeds would show high variability in fruit shape, taste, and sex ratio, rendering them commercially useless.
In contrast, if hand pollination (controlled crossing) is practiced under cages or bags, the requirement for such a large physical isolation distance is reduced, but for standard "open pollination," 3 Km is the mandatory requirement.
Step 3: Final Answer:
The standard isolation distance for open-pollinated papaya seed production is 3 Km.
Isolation distance is the minimum required distance between two varieties of the same crop (or between the crop and a wild relative) to prevent genetic contamination through cross-pollination. This is a critical parameter in seed production to ensure the genetic purity and "trueness-to-type" of the produced seeds.
Step 2: Detailed Explanation:
Papaya (Carica papaya) is a highly cross-pollinated crop. Pollination is primarily carried out by insects (like bees and moths) and sometimes by wind. Because papaya can be dioecious (separate male and female plants), gynodioecious (female and hermaphrodite plants), or monoecious, the risk of outcrossing with neighboring plantations is extremely high.
For the production of foundation and certified seeds through open pollination, the Indian Minimum Seed Certification Standards (IMSCS) prescribe a very large isolation distance due to the long-range movement of insect pollinators and the airborne nature of the light pollen grains.
An isolation distance of 3 Km (3000 meters) is maintained for papaya seed production plots. This distance acts as a buffer to ensure that no foreign pollen from undesirable or different papaya varieties reaches the mother plants in the seed production block. In the absence of such a distance, the resulting seeds would show high variability in fruit shape, taste, and sex ratio, rendering them commercially useless.
In contrast, if hand pollination (controlled crossing) is practiced under cages or bags, the requirement for such a large physical isolation distance is reduced, but for standard "open pollination," 3 Km is the mandatory requirement.
Step 3: Final Answer:
The standard isolation distance for open-pollinated papaya seed production is 3 Km.
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