Resource Acquisition And Transport In Plants

Front 1

Phyllotaxy

Back 1

Arrangement of leaves on a stem

Front 2

Passive Transport

Back 2

Diffusion across a membrane

Front 3

Active Transport

Back 3

Pumping of a solute across a membrane against its electrochemical gradient. Uses energy

Front 4

Transport Proteins

Back 4

Aid in the transport of solutes across cell membranes

Front 5

Proton Pumps

Back 5

Use energy from ATP to pump protons out of the cell

Front 6

Membrane Potential

Back 6

For positive ions. Form of potential energy that can be harnessed to perform cellular work

Front 7

Cotransport

Back 7

For negative ions. Where a transport protein couples the diffusion of one solute with active transport of another.

Front 8

"Coattail effect"

Back 8

For neutral solutes (ex. sugar). Cotransports with the proton down the steep prton gradient

Front 9

Osmosis

Back 9

Diffusion of water across a membrane

Front 10

Water potential

Back 10

The effects of solute concentration and physical pressure. Determines the direction of water movement

Front 11

"Potential" in Water Potential

Back 11

Water's capacity to perform wok when it moves from a region of high water potential to a region of lower water potential.

Front 12

Megapascals

Back 12

Measure of units of psi

Front 13

Solute Potential

Back 13

Aka osmotic potential. Solutes affect the direction of osmosis

Front 14

Pressure Potential

Back 14

Physical pressure on a solution

Front 15

Turgor Pressure

Back 15

Force against the cell wall after the influx of water and swelling of the cell due to osmosis

Front 16

Flaccid

Back 16

Limp. Result of a loss of water

Front 17

Plasmolysis

Back 17

Cell's protoplast shrinks and pulls away from the cell wall

Front 18

Wilting

Back 18

When leaves and stems droop as a result of cells losing water

Front 19

Aquaporins

Back 19

Transport proteins that facilitate the diffusion of water

Front 20

Apoplast

Back 20

The conitnuum formed by teh cell walls, extracellular spaces, and the dead interiors of tracheids and vessels

Front 21

Symplast

Back 21

Cytosol (inside) of cells

Front 22

Plasmodesmata

Back 22

Cytoplasmic channels that connect the cytoplasm of neighboring cells

Front 23

Bulk Flow

Back 23

Movement of a fluid driven by pressure

Front 24

Endodermis

Back 24

Innermost layer of cells in the root cortex

Front 25

Casparian Strip

Back 25

Belt made of suberin that blocks the passage of minerals into the stele

Front 26

Xylem Sap

Back 26

The water and minerals dissolved in the xylem

Front 27

Transpiration

Back 27

The loss of water vapor from leaves and other aerial parts of the plant

Front 28

Root pressure

Back 28

A push of xylem sap

Front 29

Guttation

Back 29

The exudation of water droplets on the tips or edges of some plant leaves

Front 30

Cavitation

Back 30

The formation of a water vapor pocket

Front 31

Circadian Rhythms

Back 31

Cycles with intervals of approximately 24 hours

Front 32

Translocation

Back 32

Transportation of products of photosynthesis

Front 33

Phloem Sap

Back 33

The aqueous solution, made of sugar, and possibly amino acids, hormones, and minerals

Front 34

Sugar Source

Back 34

A plant organ that is a net PRODUCER of sugar

Front 35

Sugar Sink

Back 35

An organ that is a net CONSUMER or depository of sugar

Front 36

Pressure flow

Back 36

Bulk flow driven by positive pressure