9.2 Water Transport In Multicellular Plants

Question 1

Turgor pressure (hydrostatic pressure)

Answer 1

Result of osmosis in plant cells, provides hydrostatic skeleton to support stems and leaves.

Question 2

Root hair cells

Answer 2

Exchange surface in plants. Specialised epidermal cell near growing root tip

Question 3

Symplast pathway

Answer 3

Where water moves between cytoplasm/vacuoles of adjacent cells through osmosis. Allows water to go from root hair cells to xylem

Question 4

Apoplast pathway

Answer 4

Movement of water through the apoplast, cells walls and intercellular spaces. Water enters xylem, pulling more molecules through due to cohesion. Continuous flow of water through open structure of the cellulose wall

Question 5

Endodermis

Answer 5

Layer of cells surrounding the vascular tissue (phloem and xylem) of the roots

Question 6

Casparian strip

Answer 6

Band of waxy material called suberin that runs around each endodermal cell forming a waterproof layer. Causes water to be forced into cytoplasm of the cell. Once forced in it joins the symplast pathway

Question 7

Cyanide

Answer 7

Type of poison, affects mitochondria preventing the production of ATP

Question 8

Guttation

Answer 8

Process if secretion of water droplets from the pores of some vascular plants eg. Grass