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

From the table, which statements about plant transpiration are correct?

• A

• B

• C

• D

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

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

• 
• 
• 
• 

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?

• guard cells

• palisade cells

• phloem

• xylem

Transpiration is defined as the loss of water vapour from plant leaves by evaporation of water at the surfaces of the mesophyll cells followed by diffusion of water vapour through the stomata.

• True

• False

Which substances do root hairs take from the soil?

• water and carbon dioxide

• water and mineral ions

• carbon dioxide and oxygen and mineral ions

• carbon dioxide and oxygen and water

The three essential elements for plant growth are...

• potassium, carbon dioxide, and oxygen

• nitrogen, magnesium, and oxygen

• zinc, magnesium, and nitrogen

• nitrogen, phosphorus, and potassium

Which substances are transported in the phloem?

• amino acids and starch

• amino acids and sucrose

• protein and starch

• starch and sucrose

From which part of a leaf does most water evaporate during transpiration?

• the cuticle

• the guard cells

• the spongy mesophyll cells

• the xylem vessels

The diagram shows a section through a leaf.

Which cell type absorbs the most carbon dioxide during the day?

• A

• B

• C

• D