Question

multiple choice question
what protein is released by leaf cells and travels in sieve tubes to trigger flower production?
gibberellin
florigen
auxin
phytochrome

Explanation:

Florigen is a protein that is synthesized in leaf cells and then travels through sieve tubes (in the phloem) to the shoot apical meristem to trigger the transition from vegetative growth to flowering. Gibberellin is a plant hormone involved in stem elongation, seed germination etc. Auxin is a plant hormone related to growth (like cell elongation, phototropism). Phytochrome is a photoreceptor pigment involved in light - mediated responses in plants.

Answer:

florigen