Plant Hormones

Question 1

Auxins main job

Answer 1

Cell elongation

Question 2

What do auxins prevent

Answer 2

Prevents abscission

Question 3

How are auxins important in phototropism?

Answer 3

Auxins in the stem move away from sunlight to the shady side which makes the plant uneven and have no choice but to grow one way- towards the sun

Question 4

True or false - auxins have cell specialization/ differentiation

Answer 4

TRUE

Question 5

Auxins produced by what

Answer 5

Apical meristem

Question 6

Cytokinins main role

Answer 6

Cell division

Question 7

Gibberellin

Answer 7

Major rôles : growth hormone , stem elongation

Question 8

What must a seed have in order to germinate ?

Answer 8

Gibberellin

Question 9

Ethylene

Answer 9

Major rôle- fruit rippening; has gas that is released and causes the cell wall to be broken down which is what makes the fruit softer, also releases the stored sugar in the fruit

Question 10

What does ethylene promote?

Answer 10

Promotes abscission/ works against auxins

Question 11

Geotropism

Answer 11

Plants grow downward

Question 12

Thigmotropism

Answer 12

Touch response, loss of turgor pressure

Question 13

Photoperiodism

Answer 13

Short day = 8 hrs or less of sunlight
Long day = 16 hours of darkness

Question 14

Circadian rhythms

Answer 14

Biological clocks, plants to stay in tune with their environment (flower opening and closing)

Question 15

Ethylene has mechanical stress which means

Answer 15

Stem thickening