Question:
Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A): Self pollination by natural means is frequent in Vanilla
Reason (R): Hand pollination is an important part of vanilla cultivation
In light of the above statements, choose the correct answer from the options given below:
Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A): Self pollination by natural means is frequent in Vanilla
Reason (R): Hand pollination is an important part of vanilla cultivation
In light of the above statements, choose the correct answer from the options given below:
Assertion (A): Self pollination by natural means is frequent in Vanilla
Reason (R): Hand pollination is an important part of vanilla cultivation
In light of the above statements, choose the correct answer from the options given below:
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The Albius hand-pollination method must be carried out in the early morning hours.
Vanilla flowers open for only one day, usually from sunrise until midday, during which they must be pollinated.
Vanilla flowers open for only one day, usually from sunrise until midday, during which they must be pollinated.
Updated On: Jul 31, 2026
- Both (A) and (R) are correct and (R) is the correct explanation of (A).
- Both (A) and (R) are correct but (R) is NOT the correct explanation of (A).
- (A) is correct but (R) is not correct.
- (A) is not correct but (R) is correct.
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
Vanilla (Vanilla planifolia) is a high-value climbing orchid grown for its aromatic pods.
Understanding its unique floral biology is key to managing pollination and fruit set in commercial orchards.
Step 2: Detailed Explanation:
- Assertion (A): Vanilla flowers are hermaphrodite, but they possess a physical barrier called the "rostellum".
The rostellum is a flap-like tissue that separates the male anther from the female stigma within the same flower.
Because of this physical barrier, natural self-pollination cannot occur easily.
In its native habitat (Mexico), specific stingless bees of the genus Melipona facilitate pollination.
Outside of this region, natural pollination is extremely low (less than 1%).
Thus, natural self-pollination is not frequent in Vanilla, making Assertion (A) incorrect.
- Reason (R): Because natural pollination is rare, hand pollination is an absolute requirement for commercial vanilla farming.
The Albius hand-pollination method, developed in 1841, is used in commercial orchards.
Workers use a small bamboo needle or stick to lift the rostellum and press the pollen mass against the stigma.
This labor-intensive practice is essential for commercial vanilla production. Thus, Reason (R) is correct.
Therefore, (A) is not correct, but (R) is correct.
Step 3: Final Answer:
Assertion (A) is false, but Reason (R) is correct, corresponding to option (D).
Vanilla (Vanilla planifolia) is a high-value climbing orchid grown for its aromatic pods.
Understanding its unique floral biology is key to managing pollination and fruit set in commercial orchards.
Step 2: Detailed Explanation:
- Assertion (A): Vanilla flowers are hermaphrodite, but they possess a physical barrier called the "rostellum".
The rostellum is a flap-like tissue that separates the male anther from the female stigma within the same flower.
Because of this physical barrier, natural self-pollination cannot occur easily.
In its native habitat (Mexico), specific stingless bees of the genus Melipona facilitate pollination.
Outside of this region, natural pollination is extremely low (less than 1%).
Thus, natural self-pollination is not frequent in Vanilla, making Assertion (A) incorrect.
- Reason (R): Because natural pollination is rare, hand pollination is an absolute requirement for commercial vanilla farming.
The Albius hand-pollination method, developed in 1841, is used in commercial orchards.
Workers use a small bamboo needle or stick to lift the rostellum and press the pollen mass against the stigma.
This labor-intensive practice is essential for commercial vanilla production. Thus, Reason (R) is correct.
Therefore, (A) is not correct, but (R) is correct.
Step 3: Final Answer:
Assertion (A) is false, but Reason (R) is correct, corresponding to option (D).
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