Transport in Plants Summary

What are the specialised protein channels that help to transport water across the membrane in root hair cells?

• proton pumps

• apoptosis channels

• water channels

• aquaporins

Which tissue is the arrow pointing to?

• Phloem

• Xylem

• pith

• epidermis

Which tissue type is the arrow pointing to?

• xylem

• endodermis

• Casparian strip

• pericyle

Which tissue type is the arrow point to?

• cambium

• xylem

• phloem

• pith

Which tissue type is the arrow point to?

• endodermis

• cortex

• epidermis

• casparian strip

Cellulose in the cell walls of xylem, increases the ______ of water molecules to help resist the effect of gravity.

• cohesion

• pressure

• adhesion

• arrangement

In xylem, there are gaps within the lignin called _____. These allow surrounding cells to be supplied with water.

• holes

• plasmolemma

• pits

• companion cells

The Casparian strip contains a waterproof band made of ______ that prevents further progress of water in the cell walls.

• lignin

• cellulose

• suberin

• starch

Movement of water through the cytoplasm and plasmodesmata in the root, is known as the:

• apoplastic pathway

• symplastic pathway

• cellular pathway

• vacuolar pathway

Hairs on the inner epidermis of xerophytes reduce air-flow and trap moist air. They are called:

• sunken stomata

• trichomes

• spikes

• projections