Youtube - Plant Control

Front 1

Do plants have hormones

Back 1

yes

Front 2

Five plant hormones

Back 2

auxin, cytokinins, gibberellins, abscisic acid and ethylene

Front 3

Auxin

Back 3

if you put a plant next the window - the plant will orient itself towards the sun

Auxin - chemical that moves towards the shady side of a stem - move away from the sun

loosens up cellulose in the cell walls where auxin is present - this will cause the stem to bend away from auxin -

makes cells grow faster where it is

auxin - moves against gravity - have a horizontal stem ________ and gravity pushing down upon it and auxin will be pushing up ..... will cause root to grow more on the upperside where the auxin is and stem will fall dowards

root will grow more

Front 4

how do the hormones move through the plants

Back 4

diffusion

Front 5

How does Auxin promote plant growth

Back 5

by increasing H+ concentration in primary cell walls - activity enzymes that loosen cellulose fibers thus turgor pressure expands cells to grow

Front 6

Cytokinins

Back 6

stimulate cytokinesis - cell division

stimulate organogenesis

stimulate growth f lateral buds

Front 7

Cytokinins

Back 7

taking one cell and making two - cytokinesis

will show lateral growth - hormone that causes cells to divide

Front 8

What promotes plant growth (elongation of cells)

Back 8

Auxin where sun is - can grow taller if sun is facing it above

Front 9

When do you see cutokinins in action (lateral growth)

Back 9

when there is something blocking the sun from reaching it.... plant will show lateral growth until it see sun again then will go back to auxin

----sun--

________ (barrier)

Y

Y=plant

....sun...

________

( ) - this small side can see sun now

Y_______(lateral growth)

Front 10

Gibberellins

Back 10

group of hormones that promote cell growth (flower and stem elongation)

Front 11

Can Gibberellins and auxin act together to stimulate growth?

Back 11

Yes

Front 12

Gibberellins

Back 12

controls the yearly cycle - tells when its time to become dormant, when to flower

humans can use it to grow seedless grapes even faster

Front 13

high concentrations of gibberellins can cause

Back 13

rapid elongations of stem and they will not be able to support weight

Front 14

Abscisic acid

Back 14

opposite of gibberellins - look at quality of light - supress fruit formation and fruit formation

causes everything to slow down and take dormancy

Front 15

How can you break dormancy from abscisic acids

Back 15

increase light or increase gibberellins

Front 16

ethylene

Back 16

gas - goes outside the parts of the plant

all fruits ripen at the same time in plants usually

if you get fruit that start to ripen that give of ethylene that will spread to other fruits to have them give off more ethylene and ripen other fruits

positive feedback system

Front 17

tropism

Back 17

growth pattern in response to an evironmental stimulus

Front 18

phototropism

Back 18

response to light - through auxin

Front 19

Where is auxin produced

Back 19

apical meristem and moves downward by active trsnport into zone of elongation -> generate growth by stimming elongation - moves in response to light

Front 20

Gravitropism (geotropism)

Back 20

response to gravity by stems and roots

if stems is hz, auxin concetration on lower side -> stem buds upwards

if root is hz, auxin is produced at apical meristem moves up in root and concetrates on lower side

Front 21

Thigmotropism

Back 21

response to touch - venous fly trap

Front 22

photoperiodism

Back 22

response of plants to changes in photoperiod - plants maintain circadian rhythm

endogenous mechanism - internal clock

Front 23

phytochrome

Back 23

proteins modified wih light0absorbing cromophore