Which graph shows most clearly what will happen to the rate of transpiration as humidity increases?

The diagram shows a potted plant and the same plant 24 hours later.

What causes the change in the appearance of the plant?

By which process is water 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?

What is transported in the phloem and what is the direction of transport?

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

The diagram shows a plant shoot and the same shoot six hours later.

Which change in environmental conditions could cause this change in the shoot?

A celery stalk is placed in a beaker of blue dye. Once the dye reaches the leaves, the stallk is taken out and cut in half.

Which diagram shows the appearance of the cut and end of the stalk?

The diagram shows a cross-section through a plant root.

Q shows the part that is stained red when the root is placed in water containing a red dye.

What is found at Q?

Which processes produce a continuous space for the flow of water in xylem vessels?

Some liquid is collected from the xylem in the stem of a plant. What is present in the liquid?

What is a function of phloem?

The diagram shows part of the trunk of a small tree with a ring of bark removed. Removing the ring of bark takes away phloem but leaves the xylem intact.

What effect will removing the bark have on the two branches?

The table shows some characteristics of four different plants.

The plants are growing in the same environmental conditions.

Which plant will have the highest rate of transpiration?

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

What is the path of water through a plant?

In which order does water pass through these tissues in a plant?

The diagram shows two shoots at the start of an experiment on transpiration.

What are the likely readings on the spring balances after three days?

Which statements about plant transpiration are correct?

The table shows the rate of water flow through a tree over a 12 hour period.

What conclusion can be drawn from the table?

What could increase the rate of water uptake by a shoot?

The diagram shows how water is lost from a leaf.

By which process is the water lost?

The diagram shows a cross-section through a plant stem.

Q shows the part that is stained red when the stem is placed in water containing a red dye. What is found at Q?

The graph shows how the rate of transpiration is affected by X.

What is X?

In what form does a plant absorb and lose water?

In which order does water pass through these structures in a plant?

Which two substances are transported in the phloem?

What is a description of transpiration?

The diagram shows the stem of a plant. A strip of the outer tissue including the phloem has been removed.

How is transport in the plant affected?

The diagram shows a plant.

What is the pathway taken by most of the water absorbed by this plant?

The diagrams show stages in the passage of water through a plant.

The circles are the starting points for arrows to show the direction in which the water moves.

Which circle must have an arrow pointing downwards only?

Translocation occurs in phloem tubes. Aphids feed on the contents of phloem tubes.

What type of food would be lacking in their diet?

Which two functions does xylem perform?

The diagram shows cells from a storage organ of a flowering plant after they have been stained with iodine solution.

Structures X stain black.

What does this show that structures X contain?

What shows the correct translocation of carbohydrate in a potato plant that is growing in bright sunlight?

Which conditions of humidity, light intensity and temperature make transpiration slowest?

The diagram shows how the appearance of a potted plant changes over a period of four days.

Which environmental conditions are most likely to cause this change?

The table shows four substances and the parts of the plant to which they are transported.

Which are examples of translocation?