Topic 7: Transport in Flowering Plant

In which direction do water molecules move in the phloem and in the xylem of a plant stem?

• phloem: upward

  xylem: downward

• phloem: downward

  xylem: upward

• phloem: both up & down

  xylem: downward

• phloem: both up & down

  xylem: upward

Water enters root hair cell by __________

• osmosis

• active transport

• diffusion

• facilitated diffusion

The diagram shows part of a tree trunk. A ring of bark including the phloem has been removed.

The tree will eventually die because removing the bark stops the transport of ____________

• mineral salts to the leaves.

•  organic nutrients to the roots.

• oxygen to the roots.

•  water to the leaves.

1. Which statement about root hairs are correct?

1. 1. The cell membrane can allow movement of water and ions into and out of the cell.

2. 2. The cell vacuole extends into the root hair.

3. 3. They are formed as an extension of the outer layer of root cells.

•  1, 2 and 3 

• 1 and 2 only

• 1 and 3 only

• 2 and 3 only

What is the main cause of water moving up to the leaves in xylem vessels?

• active transport

• evaporation from the epidermis of the leaf

• evaporation from the walls of the mesophyll cells

• use of water in photosynthesis

The diagram shows a cut plant shoot in a container of water

What will stop the movement of water up this stem?

• a fall in the humidity of the air

• a rise in the air temperature

• a blockage in the xylem

• an insect sucking sugar from the phloem

1. The diagram shows the pathway of water molecules through part of a leaf, seen under a microscope, in transverse section.

Where does water evaporate?

• A

• B

• C

• D

The diagram shows a section through a plant stem

Which process is responsible for moving substances in region Z?

• diffusion

• osmosis

• translocation

• transpiration

The diagram shows stages in the passage of water through a plant. Which arrow shows water moving in the form of water vapour? 

• A

• B

• C

• D

When stems with white flowers are cut and placed in a blue stain the petals turn blue. Which tissue in the stem does the stain travel through to reach the petals?

• epidermis

• mesophyll

• xylem

• phloem