Plant Hormones

Question 1

Plant hormones do what…

Answer 1

regulate plant function: stimulate or suppress activity in another part, produced in one part of organism

Question 2

Puberty-Like Hormones

Answer 2

Gibbrellens- produce major growth and dramatic increases in size: end seed dormancy, rapid growth of young seedlings, rapid growth of some flower stalks

Question 3

What hormone helps with fruit ripening

Answer 3

Ethylene: spreads to its fellow fruit to help them ripen faster

Question 4

What hormone stimulates cytokinesis

Answer 4

Cytokinis: final stage of cell division, produced in growing roots-seeds-and fruit
involved in growth of side branches

Question 5

What hormone gives plants length

Answer 5

Auxins lengthen plant at growing tip-stimulates growth of primary stem, controls some form of tropism

Question 6

What is tropism

Answer 6

movement of a plant in response to environmental stimulus- plants can respond to gravity, touch, light, and seasonal changes

Question 7

phototropism

Answer 7

tendency of a plant to grow towards the light, auxins build up on the shaded side of the stem, cells on the shaded side lengthen, causes stem to bend towards light

Question 8

Thigmotropism

Answer 8

plants response to touchlike stimuli: climbing plants and vines, plants that grow in direction of constant wind

Question 9

Gravitropism

Answer 9

plants response to gravitational pull
+ gravitropism=downward root growth
- gravitropism= upward shoot growth

Question 10

What other responses do plants have?

Answer 10

• some responses help protect plants against predators
• allow plants to capture food

Question 11

Photoperiodism

Answer 11

response to changing lengths of day and night: triggers some plants to flower, triggers fall colours/winter dormancy of deciduous trees