Plant Growth Regulators

Question 1

Regulates apical dominance (suppresses lateral buds)

Answer 1

auxin

Question 2

Regulates floral bud development and phyllotaxy

Answer 2

auxin

Question 3

Promote formation of lateral and adventitious roots and inhibits elongation primary root

Answer 3

auxin

Question 4

promotes fruit dev

Answer 4

auxin

Question 5

induces vascular differentiation

Answer 5

auxin

Question 6

delays onset of leaf abscission

Answer 6

auxin

Question 7

Stimulate cell elongation and cell division; stem growth and root growth (increase extensibility and lower yield threshold)

Answer 7

gibberellins

Question 8

Regulate transition from juvenile to adult

Answer 8

gibberellins

Question 9

Mediate floral initiation and influence sex determination

Answer 9

gibberellins

Question 10

Pollen development and formation of pollen tube

Answer 10

gibberellins

Question 11

Fruit set (fruit growth following pollination) and fruit growth (even without seeds = parthenocarpy)

Answer 11

gibberellins

Question 12

seed development and germination

Answer 12

giberellins

Question 13

Regulate cell division and expansion

Answer 13

cytokinins

Question 14

Modify apical dominance, promote lateral bud growth

Answer 14

cytokinins

Question 15

Induce bud formation in moss (from protonema)

Answer 15

cytokinins

Question 16

Delay leaf senescence

Answer 16

cytokinins

Question 17

Promote movement of nutrients into leaves

Answer 17

cytokinins

Question 18

Promote chloroplast development

Answer 18

cytokinins

Question 19

Break seed/bud dormancy

Answer 19

ethylene

Question 20

increase rate of leaf senescence

Answer 20

ethylene

Question 21

promote fruit ripening

Answer 21

ethylene

Question 22

Promote abscission

Answer 22

ethylene

Question 23

Hook formation in etiolated seedling

Answer 23

ethylene

Question 24

leaf epinasty (due to flooding)

Answer 24

ethylene

Question 25

Triple response (thick stem, shorter stem, horizontal root growth)

Answer 25

ethylene

Question 26

Induce formation of roots and root hairs

Answer 26

ethylene

Question 27

induce flowering in pineapples

Answer 27

ethylene

Question 28

Inhibits precocious germination and vivipary (sprouting of seeds on the plant)

Answer 28

ABA

Question 29

Promote seed storage reserve accumulation and seed desiccation tolerance

Answer 29

ABA

Question 30

As maturing seeds lose water, – (LEAs) accumulate, induced by ABA

Answer 30

late-embryogenesis-abundant proteins

Question 31

Promote bud and embryo dormancy

Answer 31

ABA

Question 32

Regulate seed dormancy by promoting desiccation tolerance

Answer 32

ABA

Question 33

Promote leaf senescence (stimulate ethylene production)

Answer 33

ABA

Question 34

During water stress, ABA

Answer 34

Inhibit shoot and promote root growth

Induce stomatal closure

Question 35

Balance of ABA and GA determines –

Answer 35

germination

Question 36

simulating process as computer algorithms

Answer 36

in silico experiments