Station 14

Interaction Among Plant Systems

Reporting Category 4Biological Processes and

Systems

Essential Question – Bell Ringer

In order for a plant to survive, why must its different systems interact?

Plant systems must interact because each individual system is specialized andcannot function on its own. Each system depends on the function of other systems to be able to carry out its own functions

Pre-Review Question

• Which type of tropism is this? 

Hormones called auxins are sent to the shady side of the plant to cause the stem to bend toward light.

• A. Thigmotropism

• B. Photostropism

• C. Geotropism

Pre-Review Question

• In plants, what part of the vascular system is responsible for sending food to the root system for winter storage? 

• A. Xylem

• B. Spongy Mesophyll

• C. Phloem

• D. Stomata

Pre-Review Question

• In Plants, what is the path for water during transpiration? 

• A. Stomata, Leaves, Xylem, Roots

• B. Leaves, Stomata, Cambium, Roots

• C. Roots, Cambium, Phloem, Stomata

• D. Roots, Xylem, Leaves, Stomata

Pre-Review Question

• When a plant has enough water on a hot day, what happens to the guard cells? 

• A. They swell in order to open the stomata• B. They swell in order to close the stomata• C. They shrink in order to close the stomata• D. They swell in order to open the stomata

Discuss with your partner

How is it beneficial for a plant to respond to different stimuli in its environment?

A plant’s response system allows it to use the different stimuli in the environment toits advantage. For example, when a plant responds to the sun by growing toward it, the plant is optimizing photosynthesis and the benefits of light energy. A plant’s roots’ response to gravity enable them to grow in the direction of water and minerals.

Discuss with your partnerHow do the transport system parts identified in the System Parts Interactions card interact in the leaves, stems, and roots of a plant to benefit the plant?

The transport system is composed of two types of tissues: xylem and phloem. The xylem transports water and minerals from the roots, through the stems, and to the leaves. These are some of the raw materials necessary for photosynthesis and other important processes in a plant. Once food (i.e., sugar) has been produced via photosynthesis, it is distributed via the phloem to all parts of the plant to be converted into energy so that the plant can carry out its other functions.

Thigmotropism on a plant’s tendrils:

Growth in response to touch or physical contact) allows the tendrils to grasp onto objects so that the plant can grow and be supported by the object. This often enables plants to grow in ways that allow them to compete with other plants for available sunlight.

In your journal, explain the effects of…...

Phototropism on the stems and leaves of a plant:

Phototropism (growth in the direction of a light source) places the plant’s stems and leaves in a more optimum position to receive sunlight for photosynthesis.

In your journal, explain the effects of…...

Geotropism on the roots and leaves of a plant:

Geotropism (growth in response to gravity) helps control the direction that roots grow. As roots grow down into the soil, they are more apt to reach moisture and minerals in the soil.

In your journal, explain the effects of…...

I need to remember……..• Plants, like animals, are composed of different

systems that interact to benefit the plant.

•Some systems enable the plant to respond to stimuli it receives from its environment, such as touch, light, and gravity.

•One system cannot survive without interacting and depending on other systems in the plant.

•Each system is composed of smaller systems; for example, the transport system is composed of xylem and phloem found in the leaves, stems, and roots of plants.

•The reproductive system reproduces either by sexual or asexual means, depending on the plant.

Post-Review Question

• A. Thigmotropism

• B. Photostropism

• C. Geotropism

Post-Review Question

• A. Thigmotropism

• B. Photostropism

• C. Geotropism

Post-Review Question• A. Thigmotropism

• B. Photostropism

• C. Geotropism

Post-Review Question• A. Thigmotropism

• B. Photostropism

• C. Geotropism