IB Biology: C3.1-The Role of Auxins and Cytokinins

Why are both auxins and cytokinins important for plant growth?

• They help in the photosynthesis process.

• They are essential for the growth of both the roots and shoots of plants.

• They regulate the water intake in plants.

• They are responsible for the color of the flowers.

What is the role of cytokinins in plant growth?

• Cytokinins promote cell division.

• Cytokinins inhibit root growth.

• Cytokinins enhance leaf senescence.

• Cytokinins increase fruit ripening.

What is the role of auxins in plant growth?

• Auxins promote cell division.

• Auxins inhibit root growth.

• Auxins promote cell elongation.

• Auxins decrease photosynthesis.

What is the antagonistic effect of auxins and cytokinins?

• Auxins promote cell elongation while cytokinins inhibit it.

• Auxins and cytokinins have opposite effects, known as antagonism.

• Cytokinins promote root growth while auxins promote leaf growth.

• Auxins and cytokinins work together to enhance plant growth.

Where are cytokinins produced and how are they transported?

• Cytokinins are produced by leaves and transported down to the roots in the phloem.

• Cytokinins are produced by meristems in the root and transported up to the shoot in the xylem.

• Cytokinins are produced in the flowers and transported through the air.

• Cytokinins are produced by the stem and transported laterally through the cortex.

Where are auxins produced and how are they transported?

• Auxins are produced by differentiated cells in the root tips and transported up to the leaves in the xylem.

• Auxins are produced by undifferentiated meristem cells in the shoot tips and transported down to the roots in the phloem.

• Auxins are produced in the leaves and transported to the flowers through the phloem.

• Auxins are produced in the stems and transported to the roots through the xylem.

How do auxins and cytokinins interact at certain concentrations?

• They inhibit each other's effects on growth.

• They work synergistically together to promote root and shoot growth.

• They have no effect on plant growth at any concentration.

• They only promote root growth, not shoot growth.