TEKS B.10(B) - Plant Systems

Gibberellins are hormones produced in the root tips of plants. The plant uses these hormones to stimulate the growth of shoots.

How are gibberellins able to affect other parts of the plant?

• Gibberellins are absorbed through the stomata and attach to chloroplasts.

• Gibberellins are transported through vascular tissues to other parts of the plant.

• Gibberellins become concentrated within the tissues of the plant during mitosis.

• Gibberellins become modified once they infect healthy cells and are later released to infect other cells.

A chart of some plant systems and functions is shown.

Which system interactions are dependent on the plant's ability to respond to the direction of light?

• Option 1

• Option 2

• Option 3

• Option 4

Plant roots have extensions called root hairs. These root hairs. These root hairs are important in the homeostasis

of the plant.

Which statement best explains the importance of the root hair to the stems and leaves of the plant?

• Root hairs convert minerals into glucose for immediate use by cells.

• Root hairs decrease the need for osmosis and diffusion in vascular tissue.

• Root hairs prevent water loss in leaves through transportation and gas exchange.

• Root hairs increase the surface area of the roots for nutrient and water absorption.

A corn plant produces both male and female flowers. The male flower forms the tassel and the female flower forms the ear of corn. The silk that emerge from the ear are the stigma of the female flower. Each silk leads to an ovule that can become a corn seed.

Which of these must happen for corn seeds to develop on the ear?

• More tassels that silks need to be present on the same plant.

• Pollen grains must fall from tassels and land on the silks of the ear.

• Pollen must be transported from the tassel to the silk through the phloem.

• The tassels must come into direct contact with the silks of the ear.

Fruits grown in hot climates are usually less sweet than those grown in cooler temperatures. The high temperatures increase the rate of respiration in the plants, thus reducing the sugar content in some fruits.

Why does increased respiration in the leaves and stems reduce the sugar content in the fruits of a plant?

• Chloroplasts move from the fruits to the leaves and stems to provide energy for respiration.

• The flow of nutrients shifts from the phloem to the xylem, moving nutrients away from the fruits.

• Sugars are moved from the fruits to the roots for storage.

• Sugars produced in the leaves are used as an energy source instead of being stored in fruits.