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Parthenocarpic tomato fruits can be produced by

1. treating the plants with low concentrations of gibberellic acid and auxins
2. raising the plants from vernalized seeds
3. treating the plants with phenylmercuric acetate
4. removing androecium of flowers before pollen grains are released

Correct answer: treating the plants with low concentrations of gibberellic acid and auxins

Solution

Parthenocarpic fruits develop without fertilization, and low doses of growth regulators like gibberellins and auxins can induce this fruit set in tomato. The other choices do not specifically promote seedless fruit formation in this way.

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