Plant Control

How does auxin contribute to a plant stem bending towards a light source?

• It causes cells on the illuminated side to elongate more rapidly.

• It inhibits cell division on the shaded side, leading to bending.

• It migrates to the shaded side of the stem, promoting cell elongation there.

• It strengthens the cell walls on the illuminated side, pulling the stem.

What is the primary role of cytokinins in plant growth?

• Promoting stem elongation and seed germination.

• Inducing dormancy and leaf abscission.

• Stimulating cell division and lateral growth.

• Accelerating fruit ripening.

What effect do gibberellins have on plant growth?

• They promote the ripening of fruits.

• They induce dormancy in seeds and buds.

• They stimulate rapid stem elongation and can break dormancy.

• They cause leaves to fall off in autumn.

Which plant hormone is a gas that promotes fruit ripening through a positive feedback loop?

• Auxin

• Cytokinin

• Abscisic acid

• Ethylene