Question:
Which of the following growth regulator is most effective for induction of female flower in watermelon?
Which of the following growth regulator is most effective for induction of female flower in watermelon?
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Remember sex expression in cucurbits:
- Ethrel (Ethylene): Promotes female flowers in cucurbits
- GA3 (Gibberellic acid): Promotes male flowers
- Silver nitrate: Promotes male flowers in gynoecious cucumber
- NAA: Used for fruit set and development
Ethrel is widely used for increasing female flower ratio in watermelon and muskmelon.
- Ethrel (Ethylene): Promotes female flowers in cucurbits
- GA3 (Gibberellic acid): Promotes male flowers
- Silver nitrate: Promotes male flowers in gynoecious cucumber
- NAA: Used for fruit set and development
Ethrel is widely used for increasing female flower ratio in watermelon and muskmelon.
Updated On: Aug 19, 2026
- Ethrel 150-200 ppm
- MH 100 ppm
- Calcium 20 ppm
- TIBA 25-50 ppm
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
This question tests knowledge of plant growth regulators in cucurbit sex expression.
Step 2: Detailed Explanation:
Ethrel (150-200 ppm) is most effective for induction of female flowers in watermelon.
Ethrel releases ethylene which promotes female flower development.
Mode of action:
- Ethylene inhibits male flower development.
- Promotes formation of female flowers.
- Shifts the sex ratio towards femaleness.
Other growth regulators:
- MH (B): Male hydrazide, used as a plant growth inhibitor, not for female flower induction.
- Calcium (C): Nutrient, not a growth regulator.
- TIBA (D): TIBA (2,3,5-triiodobenzoic acid) is an auxin inhibitor, used for branching, not female flower induction.
Thus, Ethrel is the most effective growth regulator for female flower induction in watermelon.
Step 3: Final Answer:
Thus, Ethrel 150-200 ppm is most effective for induction of female flower in watermelon, which corresponds to option (A).
[0.5cm]
This question tests knowledge of plant growth regulators in cucurbit sex expression.
Step 2: Detailed Explanation:
Ethrel (150-200 ppm) is most effective for induction of female flowers in watermelon.
Ethrel releases ethylene which promotes female flower development.
Mode of action:
- Ethylene inhibits male flower development.
- Promotes formation of female flowers.
- Shifts the sex ratio towards femaleness.
Other growth regulators:
- MH (B): Male hydrazide, used as a plant growth inhibitor, not for female flower induction.
- Calcium (C): Nutrient, not a growth regulator.
- TIBA (D): TIBA (2,3,5-triiodobenzoic acid) is an auxin inhibitor, used for branching, not female flower induction.
Thus, Ethrel is the most effective growth regulator for female flower induction in watermelon.
Step 3: Final Answer:
Thus, Ethrel 150-200 ppm is most effective for induction of female flower in watermelon, which corresponds to option (A).
[0.5cm]
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