Question

To induce feminising effect in cucurbits, which of the following combinations of plant growth regulators should be used?

• A. Auxin $>$ Ethylene $>$ Cytokinin
• B. Auxin $>$ Ethylene $>$ Gibberellin
• C. Auxin $=$ Gibberellin
• D. Cytokinin $>$ Auxin $>$ Ethylene

Answer 1

Answer: (A)

Auxin $>$ Ethylene $>$ Cytokinin

Answer 2

Induction of production of female flowers in a monoecious plant is termed feminisation. Various plant hormones have been found to produce different effect on different plants. In case of cucurbits like cucumber, squash etc. auxins, ethylene and cytokinins induce development of female flowers i.e., have feminising effect. On the other hand, gibberellins induce masculinisation and induce development of staminate flowers.