Question:
Silver thiosulphate/silver nitrate is used for induction of male flower in
Silver thiosulphate/silver nitrate is used for induction of male flower in
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Remember sex expression manipulation:
- Ethrel: Promotes female flowers (in cucumber, watermelon)
- GA3: Promotes male flowers
- Silver nitrate/STS: Promotes male flowers (in gynoecious cucumber)
- To produce hybrid seed in cucumber:
- Gynoecious lines used as female parent.
- Male flowers induced using silver nitrate for seed production.
- Ethrel: Promotes female flowers (in cucumber, watermelon)
- GA3: Promotes male flowers
- Silver nitrate/STS: Promotes male flowers (in gynoecious cucumber)
- To produce hybrid seed in cucumber:
- Gynoecious lines used as female parent.
- Male flowers induced using silver nitrate for seed production.
Updated On: Aug 19, 2026
- Monoecious cucumber
- Gynoecious cucumber
- Andromonoecious muskmelon
- Dioecious coccinia
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
This question tests knowledge of sex expression manipulation in cucurbits.
Step 2: Detailed Explanation:
Silver thiosulphate (STS) and silver nitrate are used to induce male flowers in gynoecious cucumber.
Gynoecious cucumber varieties:
- Have only female flowers.
- Require male flower induction for seed production.
- Silver compounds block ethylene action.
Mode of action:
- Silver compounds are ethylene inhibitors.
- Ethylene promotes female flowers in cucumber.
- By blocking ethylene, STS/Silver nitrate promotes male flower development.
Other applications:
- Monoecious cucumber (A): Already have male flowers, no induction needed.
- Andromonoecious muskmelon (C): Have both male and hermaphrodite flowers.
- Dioecious coccinia (D): Male and female plants are separate.
Thus, silver thiosulphate/silver nitrate is used for male flower induction in gynoecious cucumber.
Step 3: Final Answer:
Thus, silver thiosulphate/silver nitrate is used for induction of male flower in gynoecious cucumber, which corresponds to option (B).
[0.5cm]
This question tests knowledge of sex expression manipulation in cucurbits.
Step 2: Detailed Explanation:
Silver thiosulphate (STS) and silver nitrate are used to induce male flowers in gynoecious cucumber.
Gynoecious cucumber varieties:
- Have only female flowers.
- Require male flower induction for seed production.
- Silver compounds block ethylene action.
Mode of action:
- Silver compounds are ethylene inhibitors.
- Ethylene promotes female flowers in cucumber.
- By blocking ethylene, STS/Silver nitrate promotes male flower development.
Other applications:
- Monoecious cucumber (A): Already have male flowers, no induction needed.
- Andromonoecious muskmelon (C): Have both male and hermaphrodite flowers.
- Dioecious coccinia (D): Male and female plants are separate.
Thus, silver thiosulphate/silver nitrate is used for male flower induction in gynoecious cucumber.
Step 3: Final Answer:
Thus, silver thiosulphate/silver nitrate is used for induction of male flower in gynoecious cucumber, which corresponds to option (B).
[0.5cm]
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