Label with an R the tissue where the red dye would appear.

The image is a cross section through an Ammophila leaf, which grows on coastal sand dunes.

[Source: Charles Good: The Ohio State University at Lima]

What feature suggests that Ammophila is a xerophyte?

A. The leaf surface area is increased.

B. The rolled leaf reduces the upper epidermis area.

C. The rolled leaf protects the lower epidermis from the wind.

D. The lower epidermis can transpire more easily.

The mean stomatal density for the lower epidermis of P. decandrum was around 600 per mm². Predict how the stomatal density for the upper epidermis would compare.

In the micrograph of a plant stem, which letter indicates the xylem?

[Source: adapted from Kelvinsong/https://creativecommons.org/licenses/by/3.0/deed.en]

The apparatus in the diagram was used to assess the effects of factors on transpiration rates.

[Source: Republished with permission of Springer-Verlag from Experimentelle Pflanzenphysiologie: Band 2, Peter Schopfer, 1st edition, 1st Jan 1989; permission conveyed through Copyright Clearance Center, Inc.]

Which factor would be a controlled variable in an experiment designed to assess the effects of temperature on transpiration rate?

A. The opening and closing of stomata

B. The intensity of light striking the plant

C. The height of the water in the reservoir

D. The evaporation of water from the leaves

Evaluate the limitations of using a potometer in the investigation you suggested in (a).

Distinguish between the xylem and phloem of plants.

Label with a C the tissue where organic compounds are transported.

Describe the processes that cause water to move from the roots of plants to their leaves.

Describe how changes in weather conditions affect the transport and loss of water in plants.