Mr Neo_6093_Transport in Plants

A leafy shoot was placed in a beaker containing a blue dye and then examined 5 hours later.

Which statement explains the change in appearance?

• Blue dye stains cells in the leaves.

• Blue dye moves through the xylem.

• Blue dye moves up the stem by osmosis

• Blue dye diffuses through the cells of the plant.

Which statement explains why transpiration occurs?

• Carbon dioxide can enter a leaf only when stomata is open, so water diffuses out and is lost

• Photosynthesis only uses water produced by respiration, so all water absorbed via roots is lost through stomata

• So that the plant can transport amino acids

• So that the water produced from respiration can be excreted

In which situation would the rate of transpiration be the greatest?

• in a poorly ventilated glass house during a cool damp evening

• in a warm sunny garden when there is a gentle breeze

• in a well-ventilated room during a very warm night

• on a cool, rainy day when there is a gentle breeze

When young leaves are being formed on a plant, large quantities of mineral ions are required. Where and when is the movement of mineral ions in the plant the greatest?

• companion cells on a hot sunny day

• root hair cells on a cool cloudy day

• sieve tube elements during a warm night

• xylem vessels on a warm sunny day

Water continuously moves up the stems due to transpiration and ..........................between the water molecules.

Movement of substances is one way in ..............and two way in the ...................

• xylem , phloem

• phloem, xylem

• stem, root

More water is lost from which part of the plant?

• upper surface of leaf

• flowers

• stem

• lower surface of leaf

which of these is seen in the xylem ?

• end plate

• sieve tube element

• lignin

• nucleus

The diagram shows a section through the stem of a dicotyledonous plant. Which tissue transports sugars up the stem?

• A

• B

• C

• D

The diagram shows a section through the stem of a dicotyledonous plant. Which tissue transports dissolved minerals up the stem?

• A

• B

• C

• D