B8 - Transport in plants (Multiple Choice Questions)

The diagram below shows a potted plant and the same plant 48 hours later. What has caused the plant's appearance to change?

• A. Water loss by translocation is greater than water uptake.
• B. Water evaporating from the leaves by translocation.
• C. Water loss by transpiration is greater than water uptake.
• D. Water loss from the leaves by osmosis.

Which order below is correct in describing the pathway of water as it travels from the roots through a plant?

• A. Root hair cell → xylem → mesophyll cells → air spaces → stomata
• B. Root hair cell → xylem → air spaces → mesophyll cells → stomata
• C. Root hair cell → mesophyll cells → phloem → stomata
• D. Root hair cell → mesophyll cells - xylem → stomata

Which of the following is a correct explanation of the process of translocation in a plant?

• A. The movement of mineral ions through the xylem of a plant.
• B. The movement of sucrose and amino acids through the phloem from a source to a sink.
• C. The one-way movement of sucrose and amino acids through the phloem.
• D. The movement of sucrose and amino acids through the phloem from a sink to a source.

The diagram shows a simplified water cycle. Which of the processes listed below would be involved in the loss of water from the tree?

• A. Respiration
• B. Translocation
• C. Photosynthesis
• D. Evaporation

A potometer can be used to measure the rate that a piece of plant transpires under various conditions. Part of a potometer is shown in the diagram below. Which statement, relating to how a potometer works, is false?

• A. A potometer uses the transpiration stream to produce movement of an air bubble that can be measured.
• B. In a potometer, an air bubble moves away from the piece of plant tissue that is under investigation.
• C. In order to determine the rate of transpiration, the movement of the bubble must be measured alongside the time taken.
• D. The leaves of the plant in the potometer must be dry during the experiment.

A dicot plant is placed into a bowl of water coloured with red dye. After 1 hour, a cross section of one of the roots is cut. After 4 hours, a cross section is cut from the stem. Which labelled regions would be stained red in each case?

• A. 1 and 3
• B. 1 and 4
• C. 2 and 4
• D. 2 and 3

Which of the following is a correct explanation of the effect of root hairs on absorption?

• A. Provide a large surface area, maximising the rate of absorption of water and ions by osmosis.
• B. Provide a large surface area, maximising the rate of absorption of water by osmosis and ions by active transport.
• C. Increase the surface area, maximising the uptake of water by osmosis and ions by diffusion.
• D. Provide a surface area, increasing the rate of absorption of water and ions by active transport.

Which of the following processes is/are involved in the loss of water from the leaves of plants? 1. diffusion 2. osmosis 3. condensation 4. evaporation

• A. 1 and 3
• B. 1 only
• C. 4 only
• D. 1 and 4

A student collected some of the solution from the phloem in the stem of a plant. Which of the following would be present in the liquid?

• A. Glucose
• B. Starch
• C. Amino acids
• D. Cellulose

A decrease in which of the following factors would normally cause the transpiration rate to increase?

• A. Stomatal density
• B. Light intensity
• C. Temperature
• D. Humidity