Question:
Given below are two statements:
Statement (I): Heat tolerant tropical cauliflowers show significantly high level of self-incompatibility.
Statement (II):The European annual or snowball types are basically self-compatible in nature.
In light of the above statements, choose the most appropriate answer from the options given below.
Given below are two statements:
Statement (I): Heat tolerant tropical cauliflowers show significantly high level of self-incompatibility.
Statement (II):The European annual or snowball types are basically self-compatible in nature.
In light of the above statements, choose the most appropriate answer from the options given below.
Statement (I): Heat tolerant tropical cauliflowers show significantly high level of self-incompatibility.
Statement (II):The European annual or snowball types are basically self-compatible in nature.
In light of the above statements, choose the most appropriate answer from the options given below.
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Self-incompatibility (SI) in cauliflower:
Tropical/Indian Cauliflowers: Often highly self-incompatible (promotes outcrossing).
European Annual/Snowball Types: Generally selected to be self-compatible (allows self-pollination for seed set). This difference in breeding systems is important for cauliflower seed production.
Tropical/Indian Cauliflowers: Often highly self-incompatible (promotes outcrossing).
European Annual/Snowball Types: Generally selected to be self-compatible (allows self-pollination for seed set). This difference in breeding systems is important for cauliflower seed production.
Updated On: Jul 2, 2026
- Both Statement (I) and Statement (II) are true.
- Both Statement (I) and Statement (II) are false.
- Statement (I) is true but Statement (II) is false.
- Statement (I) is false but Statement (II) is true.
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The Correct Option is A
Approach Solution - 1
This question concerns self-incompatibility (SI) systems in cauliflower.
Statement (I): Heat tolerant tropical cauliflowers show significantly high level of self-incompatibility.
This statement is true. Many Indian or tropical cauliflower types, which are adapted to warmer conditions, exhibit strong sporophytic self-incompatibility. This SI system promotes outcrossing and is an important consideration in their breeding and seed production.
Statement (II): The European annual or snowball types are basically self-compatible in nature.
This statement is also true. Unlike the tropical types, many European annual cauliflower varieties, often referred to as "snowball" types (e.g., Snowball A, Snowball Y), have been selected for self-compatibility. This means they can set seed effectively through self-pollination, which simplifies pure line seed production for these varieties.
Since both statements accurately describe the compatibility systems in these distinct groups of cauliflower, option (1) is correct.
Both Statement (I) and Statement (II) are true.
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Approach Solution -2
Alternate approach - the breeding logic behind both statements:
Both statements make sense once you look at why breeders rely on self-incompatibility (SI). Tropical, heat-tolerant cauliflowers are largely open-pollinated populations improved by exploiting natural cross-pollination; strong sporophytic SI is precisely what forces this outcrossing and is exploited to produce hybrid seed economically in these types, so Statement (I) fits the biology. European snowball/annual types, in contrast, are typically maintained as stable, uniform pure lines; that kind of pure-line seed production is only practical if the plants can set seed on selfing, i.e. if they are self-compatible, so Statement (II) also fits. Because the breeding method used for each group only works if the stated compatibility behaviour is true, both statements must be true, confirming option (1).
Both statements make sense once you look at why breeders rely on self-incompatibility (SI). Tropical, heat-tolerant cauliflowers are largely open-pollinated populations improved by exploiting natural cross-pollination; strong sporophytic SI is precisely what forces this outcrossing and is exploited to produce hybrid seed economically in these types, so Statement (I) fits the biology. European snowball/annual types, in contrast, are typically maintained as stable, uniform pure lines; that kind of pure-line seed production is only practical if the plants can set seed on selfing, i.e. if they are self-compatible, so Statement (II) also fits. Because the breeding method used for each group only works if the stated compatibility behaviour is true, both statements must be true, confirming option (1).
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