Transport in Flowering Plants

Name the process by which a plant loses water from cells to the atmosphere.

______

Suggest the purpose of the layer of oil.

______

Describe one way in which a student could use this apparatus to obtain a value for the amount of water the plant loses in 24 hours.

______

Water is lost mainly through the plant's stomata.

Name three types of cell that the water passes through before it reaches the stomata in the leaves.

Write the names of the types of cell in the correct order in the boxes.

Sketch a graph on these axes of the expected results for this investigation.

Explain what your graph shows about the effect of humidity on water loss.

Biological processes in plants are affected by environmental factors.

The graphs each show the effect of changing one environmental factor on a biological process.

The labels on the axes for each graph have been replaced with the letters P, Q, R and S.

Identify the correct axis label for each of P, Q, R and S.

Select from the following possible labels.

temperature
carbon dioxide concentration
rate of transpiration
light intensity
rate of photosynthesis
air humidity

P ______

Q ______

R ______

S ______

Describe the process of transpiration in the leaf of a plant.

Identify cell type B.

B ______

Water travels from A to D. The arrows on the diagram represent the movement of water molecules during transpiration. With reference to these arrows, name and define each process taking place.

arrow 1 ______
arrow 2 ______
arrow 3 ______

Leaves from different plant species transpire at different rates in the same environmental conditions.
Suggest and explain structural differences in the lower surface of these leaves which might produce differences in the transpiration rate.

Describe the pathway of water molecules from the soil, through a plant and into the atmosphere.

Explain how variation in one named environmental factor would lead to an increase in the rate of water loss from a plant.

Name the process by which plants lose water to the atmosphere.

______

Suggest three reasons for the differences in rates of water loss shown by the three plant species.

1. ______
2. ______
3. ______

Continue the lines on the graph to show what would happen to the rates of water loss for plants E and F.

Explain the shape of each line you have drawn.

plant E ______

plant F ______

Name the parts A, B, C and D in Fig. 2.1.

A = ______
B = ______
C = ______
D = ______

Describe the pathway taken by water as it moves from the potometer, through the plant stem and into the surrounding air.

In an experiment, the bubble moved a distance of $60\text{ mm}$ in $10\text{ minutes}$.
Calculate the average rate at which the bubble moved in $\text{mm per min}$.

rate = ______ $\text{mm per min}$

The experiment was repeated in an area of lower light intensity.

Predict and explain what would happen to the rate at which the bubble moved.

prediction: ______
explanation: ______

State the time of day at which the combined loss of water vapour from the two plants is at its greatest.

______

the difference between the total amount of water vapour lost by plants F and G during the 14-hour period,

the change in rate of water vapour loss by plant F from 06.00 hours to 12.00 hours.

The leaves of plant G have their lowest temperature at 12.00 hours. Suggest reasons for this.

Using a labelling line and the letter X, show, on Fig. 1.1, the location of the xylem tissue in the transverse section (TS) of the root.

Complete the transverse section (TS) of the stem in Fig. 1.1 to show the distribution of xylem and phloem tissue.

Using a label line and the letter P, show the location of the phloem tissue that you have drawn.

State the functions of phloem tissue.