Transport in Plants

The diagram shows a potted plant and the same plant 24 hours later. What causes the change in the appearance of the plant?

• Water loss is greater than water uptake.

• Water moves from the leaves to the stem.

• Water uptake is equal to water loss.

• Water uptake is greater than water loss.

By which process is water vapor lost from a leaf?

The lower end of a plant stem is placed in water coloured with red dye. After three hours, the stem is cut as shown in the diagram. Which labelled region is stained red?

• A

• B

• C

• D

In which order does water pass through the cells of a plant, as the water travels from the roots to

a leaf?

• mesophyll cells → root hair → root cortex → xylem

• root cortex → root hair → xylem → mesophyll cells

• root hair → mesophyll cells → root cortex → xylem

• root hair → root cortex → xylem → mesophyll cells

What is the function of phloem?

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A decrease in which factor normally causes transpiration rate to increase?

• humidity

• light intensity

• stomatal opening

• temperature

Which two substances are transported in the phloem?

• amino acids and protein

• amino acids and sucrose

• protein and starch

• starch and sucrose

Define transpiration.

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