Cytokinins and Plant Growth Effects

Where are cytokinins primarily produced in plants?

• Phloem and mature stems

• Meristems of roots, leaves, young fruits, and developing seeds

• Old leaves and senescent flowers

• Only in the tips of the roots

How are cytokinins transported throughout the plant?

• Through the phloem, along with organic sap.

• Through the xylem, along with crude sap.

• By diffusion through the cell walls.

• Via specialized hormone-carrying proteins.

Besides promoting growth, what other effect do cytokinins have on plants?

• Accelerate the aging of leaves and flowers.

• Inhibit the development of axial buds.

• Retard the senescence of leaves and flowers.

• Promote the shedding of fruits.

Where are cytokinins primarily produced in plants, and how are they transported?

• Produced in mature leaves and transported via phloem.

• Produced in meristems of roots, leaves, young fruits, and developing seeds, then transported via xylem.

• Produced in flowers and transported through the cambium.

• Produced in the stem and transported through the epidermis.

What is the primary role of cytokinins in plant growth?

• Increasing the size of individual cells.

• Promoting cell multiplication through division.

• Inhibiting the development of new cells.

• Stimulating the elongation of plant stems.

How do cytokinins delay the aging process (senescence) in plant leaves and flowers?

• By increasing the rate of cellular respiration.

• By stimulating the synthesis of RNA and proteins, maintaining cell structure.

• By promoting the breakdown of cellular components.

• By reducing water absorption in the cells.

Why do florists often add cytokinins to the water of cut flowers?

• To enhance their fragrance.

• To accelerate their blooming process.

• To delay their wilting and extend their freshness.

• To change their color.

What is a primary function of cytokinins in plants?

• Transporting water and minerals.

• Retarding the aging of leaves and flowers.

• Inhibiting cell division.

• Promoting vertical stem growth.

How do apical and lateral buds contribute to plant growth?

• Apical buds promote lateral branching, while lateral buds promote vertical growth.

• Both apical and lateral buds promote vertical growth.

• Apical buds promote vertical growth, while lateral buds promote branching.

• Both apical and lateral buds inhibit overall plant growth.

What is the effect of auxin, produced by the apical bud, on lateral buds?

• It stimulates the growth of lateral buds.

• It has no effect on lateral buds.

• It inhibits the growth of lateral buds.

• It promotes the development of flowers on lateral buds.