SLO Plant system Interactions

The mimosa plant displays thigmotropism by collapsing its leaves in response to touch, as shown in the pictures below. The plant on the left is undisturbed. The upper stem of the plant on the right has been touched.

What is the most likely benefit of this mechanism for the plant?

• Protection from a loss of minerals to the environment

• Protection from poor light availability

• Protection from herbivores by becoming less attractive

• Protection from overwatering

For a lab activity, some students are instructed to put a celery stalk in a red dye solution. 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 used a hand lens to see that the small tube openings along the edge of the celery stalk were also red. The cross-section is shown in the image.

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.

The diagram shows the reproductive system of a plant.

Which of the following best describes the interaction that occurs between a plant’s reproductive parts during self-fertilization?

• Pollen is released from the anther and is transferred to the stigma. A pollen tube forms and grows through the style. The pollen tube reaches the filament, where the sperm fertilizes the egg.

• Pollen moves from the ovule up through the style and is released from the stigma. The pollen is transferred to the anther, where the sperm fertilizes the egg.

• Pollen is released from the anther and is transferred to the stigma. A pollen tube forms and grows through the style. The pollen tube reaches an ovule within the ovary, where the sperm fertilizes the egg.

• Pollen is released from the stigma and is transferred to the anther. A pollen tube grows down from the anther through the filament and fuses with the ovule, where the sperm fertilizes the egg.

A flower that has both male and female reproductive structures is shown.

Which statement best describes an interaction that will allow a flowering plant to reproduce by self-pollination?

• An anther is transferred from a filament to another filament within the same flower.

• An ovule is transferred from the ovary to a petal on a different flower.

• A pollen grain is transferred from an anther to the stigma of the same flower.

• An ovary is transferred from a flower on one plant to a flower on a different plant.

A student reads this advertisement for a product containing a plant micronutrient( fertilizer) that can be added to soil.

Based on this information, the student can conclude that boron (nutrient) is absorbed by plant roots from soil and then —

• transported to reproductive tissues by the plant’s shoot system

• stored in plant stems until the flowers are pollinated

• concentrated in the roots until the plant’s reproductive tissues mature

• transported by the phloem to the stomata in leaves, where it attracts pollinators