Unit 10 Plant Systems

A student is constructing a flow chart illustrating complexity of structures. The chart begins with the simplest and ends with the most complex. Which of the following structures is most complex?

• Organ system

• Organ

• Cell

• Tissue

A student is studying wildflowers of Texas. The table below lists the types and number of wildflowers observed on a recent field trip.

-According to the above table, which level of biological organization is represented on Day 2 of the student’s observations?

• Organism

• Population

• Community

• Ecosystem

Xylem and phloem work together to transport all of the materials needed by the plant throughout the entire organisms. All of the xylem and phloem of a plant taken as a whole make up which level of organization?

• Cell

• Tissue

• Organ

• Organ System

Some students are instructed to put a celery stalk in a red dye solution for a lab activity. First the students carefully cut the bottom of the stalk with a scalpel. Then they put the stalk in the beaker with the solution and place the beaker on a shelf in the lab room. The next day they check the stalk and make observations. The students note that the leaves at the end of the stalk have changed color from green to red. The students cut across the celery stalk and use a hand lens to see that the small tube openings along the edge of the celery stalk are also red. The cross section is shown below.

-How do the plant systems work together to make this movement of liquid possible?

• The roots absorb water and minerals and move them up to the stem, while the stem moves food produced in the leaves down to the roots in tiny tubes

• The roots anchor the plant in the soil, and the stem holds the leaves up.

• The roots absorb their own water and minerals, while the stem absorbs its water and minerals through the leaves.

• The roots lose water vapor to the soil, and the stem loses water vapor through the leaves.

Leaves are part of a plant’s shoot system. The xylem tissue in leaves transports —

• the bacteria needed for nitrogen fixation in root nodules

• the wax required to coat the surface of actively growing tissue

• the water and minerals that are absorbed by the roots

• the oxygen that regulates the rate of carbohydrate production