Plant Hormones

Question 1

Plant growth regulator

Answer 1

plant hormone used to manipulate plant growth (height, flowering)

Question 2

Auxins

Answer 2

the group of hormones that help plants make roots, essential for plant growth, division, and expansion
-Induces formation of xylem and phloem
-Induces tissue regeneration after wound
-Stimulates root growth
-Required for fruit growth
-Delays senescence
-Inhibits abscission

Question 3

Rooting hormones

Answer 3

IAA, IBA, WAA (too much will inhibit growth! Always tap off)

Question 4

Cytokinin

Answer 4

-promotes cell division in roots and shoots
-involved in cell differentiation
-regulates development of roots and leaves
-Synthesized in roots, cambium and other dividing tissue
-Travels up from roots to shoots
-Signals lateral bud growth
-Delays leaf senescence
-Involved in seeds breaking dormancy
-Stimulates leaf expansion

Question 5

High auxin and low cytokinin

Answer 5

roots form

Question 6

Equal auxin and cytokinin

Answer 6

maintain

Question 7

Low auxin and high cytokinin

Answer 7

shoots form

Question 8

Apical dominance

Answer 8

auxin from the apical bud diffuses down, inhibits growth of lateral buds

Question 9

Removing the apical bud

Answer 9

removes inhibition on lateral buds

Question 10

Ethylene

Answer 10

gas that naturally occurs in plants and promotes abscission
-Influences tissue growth
-Fruit ripening
-Fruit and leaf abscission
-Senescence
-Rapid stem growth (helping seedlings emerge into the sun

Question 11

Abscisic Acid

Answer 11

once through to effect abscission
-Stimulates production of seed storage proteins
-Prevents premature germination
-In drought, roots synthesize and release this acid to reduce transpiration

Question 12

Gibberellins

Answer 12

present throughout plant, highest concentration in immature seeds
-Stem and leaf elongation
-Breaking seed dormancy (can be a substitute for cold or light requirements)

Question 13

What hormones promote abscission?

Answer 13

Ethylene and auxin