Production of Cucumber has increased manifold in recent years. Application of which of the following phytohormones has resulted in this increased yield as the hormone is known to produce female flowers in the plants:EthyleneABAGibberellinMore than one of the above   None of the above

The correct answer is Ethylene. Ethylene is a plant hormone that promotes the production of female flowers in cucumber plants, leading to an increase in yield.

Here are the steps to answer this question:

1. Understand the question: The question is asking which phytohormone is responsible for the increased yield in cucumber production because it promotes the production of female flowers in the plants.

2. Review the options: The options given are Ethylene, ABA, Gibberellin, More than one of the above, and None of the above.

3. Recall knowledge about plant hormones: Ethylene is a plant hormone known to promote the production of female flowers in plants. ABA (Abscisic Acid) is a plant hormone that mainly acts to inhibit plant growth, while Gibberellin is a plant hormone that promotes stem elongation.

4. Choose the correct answer: Based on the information, the correct answer is Ethylene.